content_browsertests failing on chromium.chromiumos/Linux ChromiumOS Tests (dbg)(1)

Builders failed on: 
- Linux ChromiumOS Tests (dbg)(1): 
  https://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%28dbg%29%281%29

sadrul@

I am certain that your CL is relevant to this failure, but could you take a look at what causes this issue?

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[ RUN      ] GpuProcessHostBrowserTest.Shutdown
[4386:4386:0410/113837.826250:11674524616:WARNING:audio_manager.cc(295)] Multiple instances of AudioManager detected
[4386:4386:0410/113837.826481:11674524723:WARNING:audio_manager.cc(254)] Multiple instances of AudioManager detected
Xlib:  extension "RANDR" missing on display ":99".
[4386:4386:0410/113837.843005:11674541250:ERROR:proxy_service.cc(1519)] ProxyConfigService for ChromeOS should be created in profile_io_data.cc::CreateProxyConfigService and this should be used only for examples.
[4452:4452:0410/113838.704519:11675402823:WARNING:ipc_message_attachment_set.cc(49)] MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[4452:4503:0410/113838.704745:11675402989:ERROR:gpu_channel.cc(547)] Channel destroyed
[4452:4503:0410/113838.704796:11675403038:WARNING:ipc_message_attachment_set.cc(49)] MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[4386:4444:0410/113838.707563:11675405807:WARNING:ipc_message_attachment_set.cc(49)] MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[4386:4444:0410/113838.708784:11675407026:WARNING:ipc_message_attachment_set.cc(49)] MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[4386:4444:0410/113838.710934:11675409176:WARNING:ipc_message_attachment_set.cc(49)] MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[4386:4444:0410/113838.712113:11675410355:WARNING:ipc_message_attachment_set.cc(49)] MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[4386:4444:0410/113838.717880:11675416123:WARNING:ipc_message_attachment_set.cc(49)] MessageAttachmentSet destroyed with unconsumed attachments: 0/1
BrowserTestBase received signal: Terminated. Backtrace:
#0 0x7f9fbc90998b base::debug::StackTrace::StackTrace()
#1 0x7f9fbc9086cc base::debug::StackTrace::StackTrace()
#2 0x0000012d11a7 content::(anonymous namespace)::DumpStackTraceSignalHandler()
#3 0x7f9fb08d7cb0 <unknown>
#4 0x7f9fc4fb4659 pthread_join
#5 0x7f9fbcabeca9 base::PlatformThread::Join()
#6 0x7f9fbcad51d6 base::Thread::Stop()
#7 0x7f9fbe55328d content::BrowserProcessSubThread::~BrowserProcessSubThread()
#8 0x7f9fbe5532d9 content::BrowserProcessSubThread::~BrowserProcessSubThread()
#9 0x7f9fbd8407bf std::default_delete<>::operator()()
#10 0x7f9fbe53a9bc std::unique_ptr<>::reset()
#11 0x7f9fbe5378c8 content::(anonymous namespace)::ResetThread_IO()
#12 0x7f9fbe536e56 content::BrowserMainLoop::ShutdownThreadsAndCleanUp()
#13 0x7f9fbe542091 content::BrowserMainRunnerImpl::Shutdown()
#14 0x0000013ddf65 ShellBrowserMain()
#15 0x0000013bd215 content::ShellMainDelegate::RunProcess()
#16 0x7f9fbfce22dd content::RunNamedProcessTypeMain()
#17 0x7f9fbfce42de content::ContentMainRunnerImpl::Run()
#18 0x7f9fbfce180a content::ContentServiceManagerMainDelegate::Run()
#19 0x7f9fad973b4a service_manager::Main()
#20 0x7f9fbfce1e0b content::ContentMain()
#21 0x0000012d0bfc content::BrowserTestBase::SetUp()
#22 0x0000012bd488 content::ContentBrowserTest::SetUp()
#23 0x00000151968e testing::internal::HandleSehExceptionsInMethodIfSupported<>()
#24 0x00000150b0a2 testing::internal::HandleExceptionsInMethodIfSupported<>()
#25 0x0000014fffe4 testing::Test::Run()
#26 0x00000150076d testing::TestInfo::Run()
#27 0x000001500d0f testing::TestCase::Run()
#28 0x00000150607c testing::internal::UnitTestImpl::RunAllTests()
#29 0x00000151cf9e testing::internal::HandleSehExceptionsInMethodIfSupported<>()
#30 0x00000150c762 testing::internal::HandleExceptionsInMethodIfSupported<>()
#31 0x000001505d1f testing::UnitTest::Run()
#32 0x0000013763d1 RUN_ALL_TESTS()
#33 0x000001375322 base::TestSuite::Run()
#34 0x0000012c9a52 content::ContentTestLauncherDelegate::RunTestSuite()
#35 0x00000131ea32 content::LaunchTests()
#36 0x0000012c98a8 main
#37 0x7f9fb08c2f45 __libc_start_main
#38 0x00000058ed74 <unknown>
[420/954] GpuProcessHostBrowserTest.Shutdown (TIMED OUT)
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