Filed by sheriff-o-matic@appspot.gserviceaccount.com on behalf of ortuno@chromium.org

virtual/.../animation-worklet-scroll-timeline.html in webkit_layout_tests failing on chromium.mac/Mac10.13 Tests (dbg)

Builders failed on: 
- Mac10.13 Tests (dbg): 
  https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.13%20Tests%20%28dbg%29

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=virtual%2Fthreaded%2Ffast%2Fanimationworklet%2Fanimation-worklet-scroll-timeline.html&testType=webkit_layout_tests

https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.13%20Tests%20%28dbg%29/3417

[5954:43267:0618/200621.832156:FATAL:scroll_timeline.cc(48)] Check failed: scroll_tree.FindNodeFromElementId(scroller_id). 
0   libbase.dylib                       0x000000010226f02e base::debug::StackTrace::StackTrace(unsigned long) + 174
1   libbase.dylib                       0x000000010226f0ed base::debug::StackTrace::StackTrace(unsigned long) + 29
2   libbase.dylib                       0x0000000101e94dfc base::debug::StackTrace::StackTrace() + 28
3   libbase.dylib                       0x0000000101f13e3c logging::LogMessage::~LogMessage() + 460
4   libbase.dylib                       0x0000000101f11ba5 logging::LogMessage::~LogMessage() + 21
5   libcc_animation.dylib               0x000000013288d283 cc::ScrollTimeline::CurrentTime(cc::ScrollTree const&, bool) const + 419
6   libcc_animation.dylib               0x000000013289d277 cc::WorkletAnimation::CurrentTime(base::TimeTicks, cc::ScrollTree const&, bool) + 167
7   libcc_animation.dylib               0x000000013289d151 cc::WorkletAnimation::NeedsUpdate(base::TimeTicks, cc::ScrollTree const&, bool) + 433
8   libcc_animation.dylib               0x000000013289c650 cc::WorkletAnimation::UpdateInputState(cc::MutatorInputState*, base::TimeTicks, cc::ScrollTree const&, bool) + 176
9   libcc_animation.dylib               0x0000000132825f5f cc::AnimationHost::CollectWorkletAnimationsState(base::TimeTicks, cc::ScrollTree const&, bool) + 1135
10  libcc_animation.dylib               0x0000000132825668 cc::AnimationHost::TickMutator(base::TimeTicks, cc::ScrollTree const&, bool) + 280
11  libcc_animation.dylib               0x0000000132826d1d cc::AnimationHost::TickAnimations(base::TimeTicks, cc::ScrollTree const&, bool) + 1133
12  libcc.dylib                         0x0000000102d39e5d cc::LayerTreeHostImpl::AnimateLayers(base::TimeTicks, bool) + 301
13  libcc.dylib                         0x0000000102d0e75f cc::LayerTreeHostImpl::AnimateInternal() + 495
14  libcc.dylib                         0x0000000102d0c3d5 cc::LayerTreeHostImpl::Animate() + 21
15  libcc.dylib                         0x0000000102d26249 cc::LayerTreeHostImpl::WillBeginImplFrame(viz::BeginFrameArgs const&) + 217
16  libcc.dylib                         0x0000000102e22abf cc::ProxyImpl::WillBeginImplFrame(viz::BeginFrameArgs const&) + 271
17  libcc.dylib                         0x0000000102b97fb3 cc::Scheduler::BeginImplFrame(viz::BeginFrameArgs const&, base::TimeTicks) + 1091
18  libcc.dylib                         0x0000000102b96b06 cc::Scheduler::BeginImplFrameWithDeadline(viz::BeginFrameArgs const&) + 4150
19  libcc.dylib                         0x0000000102b953e4 cc::Scheduler::OnBeginFrameDerivedImpl(viz::BeginFrameArgs const&) + 1940