The following layout test is flaky on [insert platform]

http/tests/security/contentSecurityPolicy/require-sri-for/require-sri-for-worker-fromblob-allowed.php

Probable cause:

crash log for renderer (pid <unknown>):
STDOUT: #CRASHED - renderer
STDERR: [1:1:1025/155037:2253986386:FATAL:ScriptWrappableVisitor.h(162)] Check failed: false. 
STDERR: #0 0x7f9d2dfeb06e base::debug::StackTrace::StackTrace()
STDERR: #1 0x7f9d2e05a59f logging::LogMessage::~LogMessage()
STDERR: #2 0x7f9d24cfb7d9 blink::ScriptWrappableVisitor::dispatchTraceWrappers()
STDERR: #3 0x7f9d24ccf3b7 blink::AdjustAndMarkTrait<>::markWrapper()
STDERR: #4 0x7f9d24ccf32d blink::TraceTrait<>::markWrapper()
STDERR: #5 0x7f9d24cfa8d4 blink::WrapperMarkingData::traceWrappers()
STDERR: #6 0x7f9d24cf9aee blink::ScriptWrappableVisitor::AdvanceTracing()
STDERR: #7 0x7f9d29827eac v8::internal::IncrementalMarking::Step()
STDERR: #8 0x7f9d298277b4 v8::internal::IncrementalMarking::AdvanceIncrementalMarking()
STDERR: #9 0x7f9d29823de5 v8::internal::IncrementalMarkingJob::Task::RunInternal()
STDERR: #10 0x7f9d29fe6e05 _ZN4base8internal13FunctorTraitsIMNS_5TimerEFvvEvE6InvokeIPS2_JEEEvS4_OT_DpOT0_
STDERR: #11 0x7f9d29fe6d21 _ZN4base8internal12InvokeHelperILb0EvE8MakeItSoIRKMNS_5TimerEFvvEJPS4_EEEvOT_DpOT0_
STDERR: #12 0x7f9d2a0007b7 _ZN4base8internal7InvokerINS0_9BindStateIMN2v84TaskEFvvEJNS0_12OwnedWrapperIS4_EEEEEFvvEE7RunImplIRKS6_RKSt5tupleIJS8_EEJLm0EEEEvOT_OT0_NS_13IndexSequenceIJXspT1_EEEE
STDERR: #13 0x7f9d2a0006fc _ZN4base8internal7InvokerINS0_9BindStateIMN2v84TaskEFvvEJNS0_12OwnedWrapperIS4_EEEEEFvvEE3RunEPNS0_13BindStateBaseE
STDERR: #14 0x7f9d2dff0f51 _ZNO4base8internal8RunMixinINS_8CallbackIFvvELNS0_8CopyModeE0ELNS0_10RepeatModeE0EEEE3RunEv
STDERR: #15 0x7f9d2dff0959 base::debug::TaskAnnotator::RunTask()
STDERR: #16 0x7f9d28852611 blink::scheduler::TaskQueueManager::ProcessTaskFromWorkQueue()
STDERR: #17 0x7f9d2884ff92 blink::scheduler::TaskQueueManager::DoWork()
STDERR: #18 0x7f9d28858a7c _ZN4base8internal13FunctorTraitsIMN5blink9scheduler16TaskQueueManagerEFvNS_9TimeTicksEbEvE6InvokeIRKNS_7WeakPtrIS4_EEJRKS5_RKbEEEvS7_OT_DpOT0_
STDERR: #19 0x7f9d28858924 _ZN4base8internal12InvokeHelperILb1EvE8MakeItSoIRKMN5blink9scheduler16TaskQueueManagerEFvNS_9TimeTicksEbERKNS_7WeakPtrIS6_EEJRKS7_RKbEEEvOT_OT0_DpOT1_
STDERR: #20 0x7f9d28858884 _ZN4base8internal7InvokerINS0_9BindStateIMN5blink9scheduler16TaskQueueManagerEFvNS_9TimeTicksEbEJNS_7WeakPtrIS5_EES6_bEEEFvvEE7RunImplIRKS8_RKSt5tupleIJSA_S6_bEEJLm0ELm1ELm2EEEEvOT_OT0_NS_13IndexSequenceIJXspT1_EEEE
STDERR: #21 0x7f9d2885875c _ZN4base8internal7InvokerINS0_9BindStateIMN5blink9scheduler16TaskQueueManagerEFvNS_9TimeTicksEbEJNS_7WeakPtrIS5_EES6_bEEEFvvEE3RunEPNS0_13BindStateBaseE
STDERR: #22 0x7f9d2dff0f51 _ZNO4base8internal8RunMixinINS_8CallbackIFvvELNS0_8CopyModeE0ELNS0_10RepeatModeE0EEEE3RunEv
STDERR: #23 0x7f9d2dff0959 base::debug::TaskAnnotator::RunTask()
STDERR: #24 0x7f9d2e08324a base::MessageLoop::RunTask()
STDERR: #25 0x7f9d2e0834d4 base::MessageLoop::DeferOrRunPendingTask()
STDERR: #26 0x7f9d2e0837be base::MessageLoop::DoWork()
STDERR: #27 0x7f9d2e09b113 base::MessagePumpDefault::Run()
STDERR: #28 0x7f9d2e082dca base::MessageLoop::RunHandler()
STDERR: #29 0x7f9d2e129f04 base::RunLoop::Run()
STDERR: #30 0x7f9d30bb437c content::RendererMain()
STDERR: #31 0x7f9d30f7cdae content::RunZygote()
STDERR: #32 0x7f9d30f7d1c0 content::RunNamedProcessTypeMain()
STDERR: #33 0x7f9d30f7f212 content::ContentMainRunnerImpl::Run()
STDERR: #34 0x7f9d30f7c452 content::ContentMain()
STDERR: #35 0x000000486c89 main
STDERR: #36 0x7f9d20fc8f45 __libc_start_main
STDERR: #37 0x000000486b75 <unknown>