The following layout test is flaky on WebKit Linux Trusty (dbg):

- http/tests/misc/video-poster-image-load-outlives-gc-without-crashing.html

See https://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=http%2Ftests%2Fmisc%2Fvideo-poster-image-load-outlives-gc-without-crashing.html&testType=webkit_layout_tests.

---

crash log for renderer (pid <unknown>):
STDOUT: #CRASHED - renderer
STDERR: [1:1:0614/033141.819273:1633725493:FATAL:blink_test_runner.cc(924)] Check failed: render_view()->GetWebView()->IsAcceleratedCompositingActive(). 
STDERR: #0 0x0000019ef447 base::debug::StackTrace::StackTrace()
STDERR: #1 0x000001a068bd logging::LogMessage::~LogMessage()
STDERR: #2 0x0000019c473e content::BlinkTestRunner::CaptureDumpContinued()
STDERR: #3 0x0000019c4298 content::BlinkTestRunner::OnLayoutDumpCompleted()
STDERR: #4 0x0000019c1b5e content::BlinkTestRunner::CaptureDump()
STDERR: #5 0x000003ff54d5 test_runner::TestRunner::WorkQueue::ProcessWorkSoon()
STDERR: #6 0x000003ff7c58 test_runner::TestRunner::LocationChangeDone()
STDERR: #7 0x000003ff7b6f test_runner::TestRunner::tryToClearTopLoadingFrame()
STDERR: #8 0x0000037d5178 blink::ProgressTracker::ProgressCompleted()
STDERR: #9 0x0000037c2a97 blink::FrameLoader::DidFinishNavigation()
STDERR: #10 0x0000037b2ea4 blink::DocumentLoader::LoadFailed()
STDERR: #11 0x0000037c25f5 blink::FrameLoader::StopAllLoaders()
STDERR: #12 0x00000336a0fa blink::LocalFrame::Detach()
STDERR: #13 0x000003333ed4 blink::WebFrame::Swap()
STDERR: #14 0x000003d38882 content::RenderFrameImpl::OnSwapOut()
STDERR: #15 0x000003d3861b _ZN3IPC8MessageTI21FrameMsg_SwapOut_MetaSt5tupleIJibN7content21FrameReplicationStateEEEvE8DispatchINS3_15RenderFrameImplES8_vMS8_FvibRKS4_EEEbPKNS_7MessageEPT_PT0_PT1_T2_
STDERR: #16 0x000003d364f4 content::RenderFrameImpl::OnMessageReceived()
STDERR: #17 0x000004150589 IPC::MessageRouter::RouteMessage()
STDERR: #18 0x0000041504c4 IPC::MessageRouter::OnMessageReceived()
STDERR: #19 0x000002ba829d content::ChildThreadImpl::OnMessageReceived()
STDERR: #20 0x000001bebaa5 IPC::ChannelProxy::Context::OnDispatchMessage()
STDERR: #21 0x0000018bdf6a _ZN4base8internal7InvokerINS0_9BindStateINS0_18IgnoreResultHelperIMN7content20BrowserMessageFilter8InternalEFbRKN3IPC7MessageEEEEJ13scoped_refptrIS6_ES8_EEEFvvEE3RunEPNS0_13BindStateBaseE
STDERR: #22 0x000000518ad1 _ZNO4base8CallbackIFvvELNS_8internal8CopyModeE0ELNS2_10RepeatModeE0EE3RunEv
STDERR: #23 0x000001a906f3 base::debug::TaskAnnotator::RunTask()
STDERR: #24 0x000002f2e753 blink::scheduler::TaskQueueManager::ProcessTaskFromWorkQueue()
STDERR: #25 0x000002f2c0d8 blink::scheduler::TaskQueueManager::DoWork()
STDERR: #26 0x0000012f9317 _ZN4base8internal7InvokerINS0_9BindStateIMN7content17AppCacheUpdateJobEFvbEJNS_7WeakPtrIS4_EEbEEEFvvEE3RunEPNS0_13BindStateBaseE
STDERR: #27 0x000000518ad1 _ZNO4base8CallbackIFvvELNS_8internal8CopyModeE0ELNS2_10RepeatModeE0EE3RunEv
STDERR: #28 0x000001a906f3 base::debug::TaskAnnotator::RunTask()
STDERR: #29 0x000001a0d81d base::MessageLoop::RunTask()
STDERR: #30 0x000001a0daf8 base::MessageLoop::DeferOrRunPendingTask()
STDERR: #31 0x000001a0dee7 base::MessageLoop::DoWork()
STDERR: #32 0x000001a0f749 base::MessagePumpDefault::Run()
STDERR: #33 0x000001a0d3f2 base::MessageLoop::Run()
STDERR: #34 0x000001a2fb87 base::RunLoop::Run()
STDERR: #35 0x000003d9d3bb content::RendererMain()
STDERR: #36 0x00000126699a content::RunZygote()
STDERR: #37 0x000001267070 content::RunNamedProcessTypeMain()
STDERR: #38 0x0000012679e2 content::ContentMainRunnerImpl::Run()
STDERR: #39 0x000002b85f74 service_manager::Main()
STDERR: #40 0x0000007fa542 content::ContentMain()
STDERR: #41 0x000000439a11 main
STDERR: #42 0x7fd70c8bbf45 __libc_start_main
STDERR: #43 0x0000004398ed <unknown>
STDERR: 
STDERR: [5138:5164:0614/033142.108205:1634014312:WARNING:crash_handler_host_linux.cc(325)] Could not translate tid, attempt = 1 retry ...