Build log:

[ RUN      ] WebViewFocusInteractiveTest.FocusAndVisibility
Xlib:  extension "RANDR" missing on display ":99".
[23794:23829:0522/100401.361264:ERROR:bus.cc(394)] Failed to connect to the bus: Could not parse server address: Unknown address type (examples of valid types are "tcp" and on UNIX "unix")
[23794:23794:0522/100401.368784:WARNING:password_store_factory.cc(250)] Using basic (unencrypted) store for password storage. See https://chromium.googlesource.com/chromium/src/+/master/docs/linux_password_storage.md for more information about password storage options.
(interactive_ui_tests:23794): LIBDBUSMENU-GLIB-WARNING **: Unable to get session bus: Unknown or unsupported transport 'disabled' for address 'disabled:'
[23794:23794:0522/100401.437968:WARNING:gaia_auth_fetcher.cc(902)] Could not reach Google Accounts servers: errno -11
LaunchProcess: failed to execvp:
xdg-desktop-menu
LaunchProcess: failed to execvp:
xdg-icon-resource
[23794:23811:0522/100401.501796:WARNING:shell_integration_linux.cc(323)] Could not install icon chrome-pagpakkpcobmfdflcenaphmpdehokmce-Default.png at size 512.
LaunchProcess: failed to execvp:
xdg-desktop-menu
[23794:23794:0522/100401.683470:INFO:CONSOLE(58)] "Setting URL to "http://localhost:40353/extensions/platform_apps/web_view/focus_visibility/guest.html".", source: chrome-extension://pagpakkpcobmfdflcenaphmpdehokmce/window.js (58)
[23794:23860:0522/100401.745969:WARNING:embedded_test_server.cc(229)] Request not handled. Returning 404: /favicon.ico
../../chrome/browser/apps/guest_view/web_view_interactive_browsertest.cc:1642: Failure
Value of: webview_button_focused_listener.WaitUntilSatisfied()
  Actual: false
Expected: true
Stack trace:
#0 0x00000237e05c testing::internal::UnitTestImpl::CurrentOsStackTraceExceptTop()
#1 0x00000237da39 testing::internal::AssertHelper::operator=()
#2 0x000002067cf3 WebViewFocusInteractiveTest_FocusAndVisibility_Test::RunTestOnMainThread()
#3 0x000004cbfe8e content::BrowserTestBase::ProxyRunTestOnMainThreadLoop()
#4 0x0000048668c9 ChromeBrowserMainParts::PreMainMessageLoopRunImpl()
#5 0x00000486558a ChromeBrowserMainParts::PreMainMessageLoopRun()
#6 0x000003061361 content::BrowserMainLoop::PreMainMessageLoopRun()
#7 0x000003523cb5 content::StartupTaskRunner::RunAllTasksNow()
#8 0x00000305fdf5 content::BrowserMainLoop::CreateStartupTasks()
#9 0x0000030640b3 content::BrowserMainRunnerImpl::Initialize()
#10 0x00000305d692 content::BrowserMain()
#11 0x00000481265b content::RunNamedProcessTypeMain()
#12 0x000004813a52 content::ContentMainRunnerImpl::Run()
#13 0x000006756fab service_manager::Main()
#14 0x000004811244 content::ContentMain()
#15 0x000004cbf9f2 content::BrowserTestBase::SetUp()
#16 0x000004833730 InProcessBrowserTest::SetUp()
[23794:23794:0522/100402.274096:WARNING:gaia_auth_fetcher.cc(902)] Could not reach Google Accounts servers: errno -11
[23794:23803:0522/100402.295567:WARNING:discardable_shared_memory_manager.cc(431)] Some MojoDiscardableSharedMemoryManagerImpls are still alive. They will be leaked.
[23794:23897:0522/100402.298643:WARNING:internal_linux.cc(64)] Failed to read /proc/23823/stat
[23794:23794:0522/100402.299980:WARNING:url_request_context_getter.cc(43)] URLRequestContextGetter leaking due to no owning thread.
[23794:23794:0522/100402.300659:WARNING:pref_notifier_impl.cc(23)] Pref observer found at shutdown.
[23794:23794:0522/100402.300672:WARNING:pref_notifier_impl.cc(23)] Pref observer found at shutdown.
[  FAILED  ] WebViewFocusInteractiveTest.FocusAndVisibility, where TypeParam =  and GetParam() =  (1143 ms)

This test was disabled on Mac for some other reason (bug 811893), but we no
longer see those failures.

Instead, we see this failure on Linux, ChromeOS and Windows. I'm going to
disable the test on those platforms.

Well, I was wrong, the Mac issue was probably not fixed.

Anyway I'll update the test soon.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1ce3f1be29cea0336a4385d0d8684eb0b4c86a11

commit 1ce3f1be29cea0336a4385d0d8684eb0b4c86a11
Author: Yuta Kitamura <yutak@chromium.org>
Date: Wed May 23 07:12:42 2018

Disable flaky test WebViewFocusInteractiveTest.FocusAndVisibility.

This test is flaky on Linux, ChromeOS and Windows. This test was also
disabled on Mac for another reason, so this test is disabled on four
platforms in total.

TBR=jbroman@chromium.org

Bug: 845638, 811893
Change-Id: Iff963f4075c34dd3ecc27596ab6ac96489b80bce
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/1070017
Reviewed-by: Yuta Kitamura <yutak@chromium.org>
Commit-Queue: Yuta Kitamura <yutak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560985}
[modify] https://crrev.com/1ce3f1be29cea0336a4385d0d8684eb0b4c86a11/chrome/browser/apps/guest_view/web_view_interactive_browsertest.cc

The test is disabled.

Can anyone in BrowserTag component own this?

@fsamuel for triage as guest_view/OWNERS