Disabled the above DCHECK but got another possibly related failure on scroll (harder to reproduce than the first one):

I    2.820s Main  pid: 9019, tid: 9143, name: Compositor  >>> org.chromium.chrome:sandboxed_process0 <<<
I    2.820s Main  signal 6 (SIGABRT), code -6 (SI_TKILL), fault addr --------
I    2.820s Main  [FATAL:scoped_web_input_event_with_latency_info.cc(28)] Check failed: other.latency_.trace_id() > latency_.trace_id() (5196 vs. 5196)
I    2.820s Main  
I    2.820s Main  Stack Trace:
I    2.820s Main    RELADDR   FUNCTION   FILE:LINE
I    2.820s Main    000ac841  <unknown>  /data/app/org.chromium.chrome-1/lib/arm/libbase.cr.so
I    2.820s Main    00a5960d  <unknown>  /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.820s Main    00a5753f  <unknown>  /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.820s Main    00a581c9  <unknown>  /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.820s Main  
I    2.820s Main  -----------------------------------------------------
I    2.820s Main  
I    2.820s Main      r0 00000000  r1 000023b7  r2 00000006  r3 98bff978
I    2.820s Main      r4 98bff980  r5 98bff930  r6 00000000  r7 0000010c
I    2.820s Main      r8 98bfd1d0  r9 00000085  sl 98de1d00  fp 98de1cc0
I    2.821s Main      ip 00000006  sp 98bfd138  lr b6cf4b61  pc b6cf6f50
I    2.821s Main  
I    2.821s Main  Stack Trace:
I    2.821s Main    RELADDR   FUNCTION                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            FILE:LINE
I    2.821s Main    00041f50  tgkill+12                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /system/lib/libc.so
I    2.821s Main    0003fb5d  pthread_kill+32                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     /system/lib/libc.so
I    2.821s Main    0001c30f  raise+10                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            /system/lib/libc.so
I    2.821s Main    000194c1  __libc_android_abort+34                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             /system/lib/libc.so
I    2.821s Main    000174ac  abort+4                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             /system/lib/libc.so
I    2.821s Main    00096ddd  base::debug::BreakDebugger()+20                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     /data/app/org.chromium.chrome-1/lib/arm/libbase.cr.so
I    2.821s Main    000acaf7  logging::LogMessage::~LogMessage()+806                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              /data/app/org.chromium.chrome-1/lib/arm/libbase.cr.so
I    2.821s Main    00a5960b  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.821s Main    00a5753d  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.821s Main    00a581c9  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.821s Main    00a56efd  content::MainThreadEventQueue::QueueEvent(std::__ndk1::unique_ptr<content::MainThreadEventQueueTask, std::__ndk1::default_delete<content::MainThreadEventQueueTask> >)+48                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.821s Main    00a56e01  content::MainThreadEventQueue::HandleEvent(std::__ndk1::unique_ptr<blink::WebInputEvent, ui::WebInputEventDeleter>, ui::LatencyInfo const&, content::InputEventDispatchType, content::InputEventAckState, base::OnceCallback<void (content::InputEventAckState, ui::LatencyInfo const&, std::__ndk1::unique_ptr<ui::DidOverscrollParams, std::__ndk1::default_delete<ui::DidOverscrollParams> >, base::Optional<cc::TouchAction>)>)+408                                                                                                                                                             /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.821s Main    00a54601  content::InputEventFilter::DidForwardToHandlerAndOverscroll(int, content::InputEventDispatchType, content::InputEventAckState, std::__ndk1::unique_ptr<blink::WebInputEvent, ui::WebInputEventDeleter>, ui::LatencyInfo const&, std::__ndk1::unique_ptr<ui::DidOverscrollParams, std::__ndk1::default_delete<ui::DidOverscrollParams> >)+208                                                                                                                                                                                                                                                        /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.821s Main    00a54e49  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.821s Main    00a54df9  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.821s Main    00a54dcf  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.821s Main    00a54db9  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.821s Main    0080d75d  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.821s Main    00a55db9  content::InputHandlerManager::DidHandleInputEventAndOverscroll(base::RepeatingCallback<void (content::InputEventAckState, std::__ndk1::unique_ptr<blink::WebInputEvent, ui::WebInputEventDeleter>, ui::LatencyInfo const&, std::__ndk1::unique_ptr<ui::DidOverscrollParams, std::__ndk1::default_delete<ui::DidOverscrollParams> >)> const&, ui::InputHandlerProxy::EventDisposition, std::__ndk1::unique_ptr<blink::WebInputEvent, ui::WebInputEventDeleter>, ui::LatencyInfo const&, std::__ndk1::unique_ptr<ui::DidOverscrollParams, std::__ndk1::default_delete<ui::DidOverscrollParams> >)+88  /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.821s Main    00a56513  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.822s Main    00a564cb  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.822s Main    00a56499  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.822s Main    00a5647d  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.822s Main    0060ecf5  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.822s Main    00688ad7  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.822s Main    00689223  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.822s Main    006892bb  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcontent.cr.so
I    2.822s Main    0010047f  cc::LayerTreeHostImpl::WillBeginImplFrame(viz::BeginFrameArgs const&)+136                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcc.cr.so
I    2.822s Main    00123dab  non-virtual thunk to cc::ProxyImpl::WillBeginImplFrame(viz::BeginFrameArgs const&)+62                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               /data/app/org.chromium.chrome-1/lib/arm/libcc.cr.so
I    2.822s Main    000c12d9  cc::Scheduler::BeginImplFrame(viz::BeginFrameArgs const&, base::TimeTicks)+304                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      /data/app/org.chromium.chrome-1/lib/arm/libcc.cr.so
I    2.822s Main    000c0cc1  cc::Scheduler::BeginImplFrameWithDeadline(viz::BeginFrameArgs const&)+896                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libcc.cr.so
I    2.822s Main    000c0565  cc::Scheduler::OnBeginFrameDerivedImpl(viz::BeginFrameArgs const&)+452                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              /data/app/org.chromium.chrome-1/lib/arm/libcc.cr.so
I    2.822s Main    00012de7  viz::BeginFrameObserverBase::OnBeginFrame(viz::BeginFrameArgs const&)+382                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libviz_common.cr.so
I    2.822s Main    00014427  viz::ExternalBeginFrameSource::OnBeginFrame(viz::BeginFrameArgs const&)+506                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         /data/app/org.chromium.chrome-1/lib/arm/libviz_common.cr.so
I    2.822s Main    0000aaf3  non-virtual thunk to viz::ClientLayerTreeFrameSink::OnBeginFrame(viz::BeginFrameArgs const&)+52                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     /data/app/org.chromium.chrome-1/lib/arm/libclient.cr.so
I    2.822s Main    0000e385  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libclient.cr.so
I    2.822s Main    0001bd0d  mojo::InterfaceEndpointClient::HandleValidatedMessage(mojo::Message*)+460                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libbindings.cr.so
I    2.822s Main    0001b97f  mojo::FilterChain::Accept(mojo::Message*)+78                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        /data/app/org.chromium.chrome-1/lib/arm/libbindings.cr.so
I    2.822s Main    0001c723  mojo::InterfaceEndpointClient::HandleIncomingMessage(mojo::Message*)+58                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             /data/app/org.chromium.chrome-1/lib/arm/libbindings.cr.so
I    2.822s Main    00020e23  mojo::internal::MultiplexRouter::ProcessIncomingMessage(mojo::internal::MultiplexRouter::MessageWrapper*, mojo::internal::MultiplexRouter::ClientCallBehavior, base::SequencedTaskRunner*)+430                                                                                                                                                                                                                                                                                                                                                                                                      /data/app/org.chromium.chrome-1/lib/arm/libbindings.cr.so
I    2.822s Main    00020b47  mojo::internal::MultiplexRouter::Accept(mojo::Message*)+178                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         /data/app/org.chromium.chrome-1/lib/arm/libbindings.cr.so
I    2.822s Main    0001b97f  mojo::FilterChain::Accept(mojo::Message*)+78                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        /data/app/org.chromium.chrome-1/lib/arm/libbindings.cr.so
I    2.822s Main    00018bff  mojo::Connector::ReadSingleMessage(unsigned int*)+218                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               /data/app/org.chromium.chrome-1/lib/arm/libbindings.cr.so
I    2.822s Main    000190fd  mojo::Connector::ReadAllAvailableMessages()+48                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      /data/app/org.chromium.chrome-1/lib/arm/libbindings.cr.so
I    2.822s Main    0001904b  mojo::Connector::OnHandleReadyInternal(unsigned int)+74                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             /data/app/org.chromium.chrome-1/lib/arm/libbindings.cr.so
I    2.823s Main    00019b01  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libbindings.cr.so
I    2.823s Main    00017799  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libbindings.cr.so
I    2.823s Main    00006f9d  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libmojo_public_system_cpp.cr.so
I    2.823s Main    00006ee5  mojo::SimpleWatcher::OnHandleReady(int, unsigned int, mojo::HandleSignalsState const&)+124                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          /data/app/org.chromium.chrome-1/lib/arm/libmojo_public_system_cpp.cr.so
I    2.823s Main    0000718d  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libmojo_public_system_cpp.cr.so
I    2.823s Main    00007167  <unknown>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           /data/app/org.chromium.chrome-1/lib/arm/libmojo_public_system_cpp.cr.so
I    2.823s Main    00097595  base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*)+136                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            /data/app/org.chromium.chrome-1/lib/arm/libbase.cr.so
I    2.823s Main    00319fcf  blink::scheduler::TaskQueueManager::ProcessTaskFromWorkQueue(blink::scheduler::internal::WorkQueue*, bool, blink::scheduler::LazyNow, base::TimeTicks*)+606                                                                                                                                                                                                                                                                                                                                                                                                                                         /data/app/org.chromium.chrome-1/lib/arm/libblink_platform.cr.so
I    2.823s Main    00318ea5  blink::scheduler::TaskQueueManager::DoWork(bool)+532                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                /data/app/org.chromium.chrome-1/lib/arm/libblink_platform.cr.so
I    2.823s Main    00097595  base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*)+136                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            /data/app/org.chromium.chrome-1/lib/arm/libbase.cr.so
I    2.823s Main    000b36ef  base::internal::IncomingTaskQueue::RunTask(base::PendingTask*)+62                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   /data/app/org.chromium.chrome-1/lib/arm/libbase.cr.so
I    2.823s Main    000b5e4d  base::MessageLoop::RunTask(base::PendingTask*)+328                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  /data/app/org.chromium.chrome-1/lib/arm/libbase.cr.so
I    2.823s Main    000b60bb  base::MessageLoop::DeferOrRunPendingTask(base::PendingTask)+114                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     /data/app/org.chromium.chrome-1/lib/arm/libbase.cr.so
I    2.823s Main    000b6253  base::MessageLoop::DoWork()+354                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     /data/app/org.chromium.chrome-1/lib/arm/libbase.cr.so
I    2.823s Main    000b7b03  base::MessagePumpDefault::Run(base::MessagePump::Delegate*)+122                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     /data/app/org.chromium.chrome-1/lib/arm/libbase.cr.so
I    2.823s Main    000b59c5  base::MessageLoop::Run(bool)+96                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     /data/app/org.chromium.chrome-1/lib/arm/libbase.cr.so
I    2.823s Main    000d4151  base::RunLoop::Run()+144                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            /data/app/org.chromium.chrome-1/lib/arm/libbase.cr.so
I    2.823s Main    000ff9d1  base::Thread::Run(base::RunLoop*)+104                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               /data/app/org.chromium.chrome-1/lib/arm/libbase.cr.so
I    2.823s Main    000ffced  base::Thread::ThreadMain()+448                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      /data/app/org.chromium.chrome-1/lib/arm/libbase.cr.so
I    2.823s Main  

Dave is this related to the coalescing change you're making?