Repro steps:
-Open up Chrome with a new user data dir.
-Turn on sync from the icon in the top right.
-Fill in your credentials
-Failure
StackTrace:
[1338:775:1017/152837.423762:FATAL:ukm_page_load_metrics_observer.cc(288)] Check failed: connect_end_ms <= send_start_ms (167222 vs. 167200)
0 libbase.dylib 0x0000000110efc02f base::debug::StackTrace::StackTrace(unsigned long) + 31
1 libbase.dylib 0x0000000110df757f logging::LogMessage::~LogMessage() + 223
2 libchrome_dll.dylib 0x000000010b446dcd UkmPageLoadMetricsObserver::ReportMainResourceTimingMetrics(ukm::builders::PageLoad*) + 1341
3 libchrome_dll.dylib 0x000000010b4465f6 UkmPageLoadMetricsObserver::RecordTimingMetrics(page_load_metrics::mojom::PageLoadTiming const&, long long) + 3302
4 libchrome_dll.dylib 0x000000010b44f502 page_load_metrics::PageLoadTracker::~PageLoadTracker() + 818
5 libchrome_dll.dylib 0x000000010b44fdae page_load_metrics::PageLoadTracker::~PageLoadTracker() + 14
6 libchrome_dll.dylib 0x000000010b414072 page_load_metrics::MetricsWebContentsObserver::DidFinishNavigation(content::NavigationHandle*) + 962
7 libcontent.dylib 0x0000000113d9fea9 content::WebContentsImpl::DidFinishNavigation(content::NavigationHandle*) + 297
8 libcontent.dylib 0x0000000113946a8c content::NavigationHandleImpl::~NavigationHandleImpl() + 140
9 libcontent.dylib 0x0000000113946f0e content::NavigationHandleImpl::~NavigationHandleImpl() + 14
10 libcontent.dylib 0x0000000113958b44 content::NavigatorImpl::DidNavigate(content::RenderFrameHostImpl*, FrameHostMsg_DidCommitProvisionalLoad_Params const&, std::__1::unique_ptr<content::NavigationHandleImpl, std::__1::default_delete<content::NavigationHandleImpl> >, bool) + 836
11 libcontent.dylib 0x000000011396e3da content::RenderFrameHostImpl::DidCommitNavigationInternal(FrameHostMsg_DidCommitProvisionalLoad_Params*, bool) + 490
12 libcontent.dylib 0x000000011396dcb6 content::RenderFrameHostImpl::DidCommitProvisionalLoad(std::__1::unique_ptr<FrameHostMsg_DidCommitProvisionalLoad_Params, std::__1::default_delete<FrameHostMsg_DidCommitProvisionalLoad_Params> >, mojo::InterfaceRequest<service_manager::mojom::InterfaceProvider>) + 1110
13 libcontent.dylib 0x00000001132fcc9d content::mojom::FrameHostStubDispatch::Accept(content::mojom::FrameHost*, mojo::Message*) + 1517
14 libbindings.dylib 0x000000010a779176 mojo::InterfaceEndpointClient::HandleValidatedMessage(mojo::Message*) + 982
15 libbindings.dylib 0x000000010a778a26 mojo::FilterChain::Accept(mojo::Message*) + 150
16 libbindings.dylib 0x000000010a77a555 mojo::InterfaceEndpointClient::HandleIncomingMessage(mojo::Message*) + 117
17 libipc.dylib 0x0000000112f32539 IPC::(anonymous namespace)::ChannelAssociatedGroupController::AcceptOnProxyThread(mojo::Message) + 761
18 libipc.dylib 0x0000000112f2f094 base::internal::Invoker<base::internal::BindState<void (IPC::(anonymous namespace)::ChannelAssociatedGroupController::*)(mojo::Message), scoped_refptr<IPC::(anonymous namespace)::ChannelAssociatedGroupController>, base::internal::PassedWrapper<mojo::Message> >, void ()>::Run(base::internal::BindStateBase*) + 228
19 libbase.dylib 0x0000000110dda906 base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*) + 310
20 libbase.dylib 0x0000000110e1290f base::MessageLoop::RunTask(base::PendingTask*) + 271
21 libbase.dylib 0x0000000110e12d03 base::MessageLoop::DoWork() + 387
22 libbase.dylib 0x0000000110e182ba base::MessagePumpCFRunLoopBase::RunWork() + 42
23 libbase.dylib 0x0000000110dfa50a base::mac::CallWithEHFrame(void () block_pointer) + 10
24 libbase.dylib 0x0000000110e17bdf base::MessagePumpCFRunLoopBase::RunWorkSource(void*) + 63
25 CoreFoundation 0x00007fff37d35a11 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
26 CoreFoundation 0x00007fff37def42c __CFRunLoopDoSource0 + 108
27 CoreFoundation 0x00007fff37d18470 __CFRunLoopDoSources0 + 208
28 CoreFoundation 0x00007fff37d178ed __CFRunLoopRun + 1293
29 CoreFoundation 0x00007fff37d17153 CFRunLoopRunSpecific + 483
30 HIToolbox 0x00007fff37001d96 RunCurrentEventLoopInMode + 286
31 HIToolbox 0x00007fff37001b06 ReceiveNextEventCommon + 613
32 HIToolbox 0x00007fff37001884 _BlockUntilNextEventMatchingListInModeWithFilter + 64
33 AppKit 0x00007fff352b2a73 _DPSNextEvent + 2085
34 AppKit 0x00007fff35a48e34 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 3044
35 libchrome_dll.dylib 0x000000010b2af480 __71-[BrowserCrApplication nextEventMatchingMask:untilDate:inMode:dequeue:]_block_invoke + 64
36 libbase.dylib 0x0000000110dfa50a base::mac::CallWithEHFrame(void () block_pointer) + 10
37 libchrome_dll.dylib 0x000000010b2af3b4 -[BrowserCrApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 164
38 AppKit 0x00007fff352a7885 -[NSApplication run] + 764
39 libbase.dylib 0x0000000110e1935c base::MessagePumpNSApplication::DoRun(base::MessagePump::Delegate*) + 364
40 libbase.dylib 0x0000000110e175ee base::MessagePumpCFRunLoopBase::Run(base::MessagePump::Delegate*) + 110
41 libbase.dylib 0x0000000110e124b4 base::MessageLoop::Run(bool) + 132
42 libbase.dylib 0x0000000110e50bf9 base::RunLoop::Run() + 249
43 libchrome_dll.dylib 0x000000010b2b64dd ChromeBrowserMainParts::MainMessageLoopRun(int*) + 253
44 libcontent.dylib 0x0000000113765744 content::BrowserMainLoop::RunMainMessageLoopParts() + 52
45 libcontent.dylib 0x00000001137685e6 content::BrowserMainRunnerImpl::Run() + 102
46 libcontent.dylib 0x0000000113761e59 content::BrowserMain(content::MainFunctionParams const&) + 233
47 libcontent.dylib 0x00000001143f55b5 content::ContentMainRunnerImpl::Run(bool) + 1029
48 libembedder.dylib 0x000000010a723d5c service_manager::Main(service_manager::MainParams const&) + 3036
49 libcontent.dylib 0x00000001143f4604 content::ContentMain(content::ContentMainParams const&) + 68
50 libchrome_dll.dylib 0x000000010a95738f ChromeMain + 175
51 Chromium 0x000000010877bdde main + 382
52 libdyld.dylib 0x00007fff5fb5f015 start + 1
53 ??? 0x0000000000000002 0x0 + 2
