See https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/chromeos-amd64-generic-rel/22248

Looks like the browser smoke tests are failing due to browser crashes. See the stack trace in the logs:
https://isolateserver.appspot.com/browse?namespace=default-gzip&digest=5cddda2e83863fd01aa9dfc9ac51b40309acd33c&as=ui.20181107-091926

eg:
Received signal 11 SEGV_MAPERR 000000000008
#0 0x55b67a7cc78f base::debug::StackTrace::StackTrace()
#1 0x55b67a7cc301 base::debug::(anonymous namespace)::StackDumpSignalHandler()
#2 0x7cf6c692b2e0 <unknown>
#3 0x55b67a61c3d7 resource_coordinator::PageSignalReceiver::AddObserver()
#4 0x55b67a6fd9a5 resource_coordinator::ResourceCoordinatorTabHelper::ResourceCoordinatorTabHelper()
#5 0x55b67cc68a4f TabHelpers::AttachTabHelpers()
#6 0x55b67cc9f7b3 Navigate()
#7 0x55b67ccb6a3c StartupBrowserCreatorImpl::OpenTabsInBrowser()
#8 0x55b67ccb75d5 StartupBrowserCreatorImpl::RestoreOrCreateBrowser()
#9 0x55b67ccb6651 StartupBrowserCreatorImpl::DetermineURLsAndLaunch()
#10 0x55b67ccb60af StartupBrowserCreatorImpl::Launch()
#11 0x55b67ccb3b35 StartupBrowserCreator::LaunchBrowser()
#12 0x55b67ccb390a StartupBrowserCreator::ProcessCmdLineImpl()
#13 0x55b67ccb2e5d StartupBrowserCreator::Start()
#14 0x55b67a3ab1c0 ChromeBrowserMainParts::PreMainMessageLoopRunImpl()
#15 0x55b67a3aa0d9 ChromeBrowserMainParts::PreMainMessageLoopRun()
#16 0x55b6794fdca4 chromeos::ChromeBrowserMainPartsChromeos::PreMainMessageLoopRun()
#17 0x55b678a90927 content::BrowserMainLoop::PreMainMessageLoopRun()
#18 0x55b678e72e37 content::StartupTaskRunner::RunAllTasksNow()
#19 0x55b678a8f463 content::BrowserMainLoop::CreateStartupTasks()
#20 0x55b678a92edd content::BrowserMainRunnerImpl::Initialize()
#21 0x55b678a8d3a1 content::BrowserMain()
#22 0x55b67a39e238 content::ContentMainRunnerImpl::Run()
#23 0x55b67a3a48cd service_manager::Main()
#24 0x55b67a39c461 content::ContentMain()
#25 0x55b677d32bdf ChromeMain
#26 0x7cf6c5d0d736 __libc_start_main
#27 0x55b677d32a09 _start


https://chromium-review.googlesource.com/c/1290775 shows up in the blamelist for that build with a lot of relevant file changes. sebmarchand@, can you take a look?