Findit identified the culprit r579950 with confidence 70.1% in the config "chromium.chromiumos / linux-chromeos-rel"
based on the flakiness trend:

https://findit-for-me.appspot.com/waterfall/flake?key=ag9zfmZpbmRpdC1mb3ItbWVy6wELEhdNYXN0ZXJGbGFrZUFuYWx5c2lzUm9vdCK0AWNocm9taXVtLmNocm9taXVtb3MvbGludXgtY2hyb21lb3MtcmVsLzExNDQwL21hc2hfYnJvd3Nlcl90ZXN0cy9RV3hzTDFCaGMzTjNiM0prVFdGdVlXZGxja0p5YjNkelpYSlVaWE4wVjJsMGFGWnBaWGR6Um1WaGRIVnlaUzVRY205dGNIUkdiM0pHWlhSamFGTjFZbTFwZEZkcGRHaHZkWFJPWVhacFoyRjBhVzl1THpBPQwLEhNNYXN0ZXJGbGFrZUFuYWx5c2lzGAEM

If the culprit above is wrong, please file a bug using this link and hit submit:
https://bugs.chromium.org/p/chromium/issues/entry?status=Unconfirmed&labels=Pri-1,Test-Findit-Wrong&components=Tools%3ETest%3EFindit%3EFlakiness&summary=%5BFindit%5D%20Flake%20Analyzer%20-%20Wrong%20result%20for%20All/PasswordManagerBrowserTestWithViewsFeature.PromptForFetchSubmitWithoutNavigation/0&comment=Link%20to%20Analysis%3A%20https://findit-for-me.appspot.com/waterfall/flake?key=ag9zfmZpbmRpdC1mb3ItbWVy6wELEhdNYXN0ZXJGbGFrZUFuYWx5c2lzUm9vdCK0AWNocm9taXVtLmNocm9taXVtb3MvbGludXgtY2hyb21lb3MtcmVsLzExNDQwL21hc2hfYnJvd3Nlcl90ZXN0cy9RV3hzTDFCaGMzTjNiM0prVFdGdVlXZGxja0p5YjNkelpYSlVaWE4wVjJsMGFGWnBaWGR6Um1WaGRIVnlaUzVRY205dGNIUkdiM0pHWlhSamFGTjFZbTFwZEZkcGRHaHZkWFJPWVhacFoyRjBhVzl1THpBPQwLEhNNYXN0ZXJGbGFrZUFuYWx5c2lzGAEM

Automatically posted by the findit-for-me app (https://goo.gl/Ot9f7N).

Assigning to sugoi@ who is actively investigating per the comments on the CL.

CCing ftirelo@ who will help investigate this.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5da0d0d16f47b5f85fc74e95e377bb3597d7264e

commit 5da0d0d16f47b5f85fc74e95e377bb3597d7264e
Author: Alexis Hetu <sugoi@google.com>
Date: Thu Aug 02 21:19:11 2018

Disabling flaky tests on ChromeOS

As a result of replacing OSMesa with SwiftShader for running browser_tests
recently, 4 tests have become flaky on ChromeOS:
SiteDetailsBrowserTest.IsolateExtensions
ArcVoiceInteractionArcHomeServiceTest.VoiceInteractionStructureMultipleSelectionTest
ExtensionApiNewTabTest.Tabs
PasswordManagerBrowserTestWithViewsFeature.PromptForFetchSubmitWithoutNavigation

This cl temporarily disables these 4 tests on ChromeOs until we can find a
proper fix for them.

TBR=vasilii@chromium.org rdevlin.cronin@chromium.org hidehiko@chromium.org
TBR_REASON="Making the linux-chromeos-rel bot less flaky"

Bug: chromium:870372  chromium:870322  chromium:870319 chromium:671891
Change-Id: I55fdd44622f7fac13dafaa19699904178e37d1fb
Reviewed-on: https://chromium-review.googlesource.com/1161202
Commit-Queue: Alexis Hétu <sugoi@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580324}
[modify] https://crrev.com/5da0d0d16f47b5f85fc74e95e377bb3597d7264e/chrome/browser/chromeos/arc/voice_interaction/arc_voice_interaction_arc_home_service_browsertest.cc
[modify] https://crrev.com/5da0d0d16f47b5f85fc74e95e377bb3597d7264e/chrome/browser/extensions/extension_tabs_apitest.cc
[modify] https://crrev.com/5da0d0d16f47b5f85fc74e95e377bb3597d7264e/chrome/browser/password_manager/password_manager_browsertest.cc
[modify] https://crrev.com/5da0d0d16f47b5f85fc74e95e377bb3597d7264e/chrome/browser/site_details_browsertest.cc

[ RUN      ] All/PasswordManagerBrowserTestWithViewsFeature.PromptForFetchSubmitWithoutNavigation/0
[32098:32098:0802/091823.092681:WARNING:chrome_browser_main_chromeos.cc(586)] Running as stub user with profile dir: test-user
[ash:32128:32128:0802/091823.169986:ERROR:shell_delegate_mash.cc(56)] Not implemented reached in virtual void ash::ShellDelegateMash::PreInit()
[ash:32128:32128:0802/091823.186659:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[ash:32128:32128:0802/091823.186686:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[ash:32128:32128:0802/091823.186691:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[ash:32128:32128:0802/091823.186713:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[ash:32128:32128:0802/091823.186717:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[ash:32128:32128:0802/091823.186722:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[ash:32128:32128:0802/091823.186737:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[ash:32128:32128:0802/091823.186741:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[ash:32128:32128:0802/091823.186745:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[ash:32128:32128:0802/091823.192818:ERROR:layer_tree_host_impl.cc(2997)] Forcing zero-copy tile initialization as worker context is missing
[32098:32098:0802/091823.219349:INFO:remote_commands_service.cc(38)] Fetching remote commands.
[32098:32098:0802/091823.219466:WARNING:remote_commands_service.cc(40)] Client is not registered.
[32098:32098:0802/091823.219502:INFO:remote_commands_invalidator.cc(32)] Initialize RemoteCommandsInvalidator.
[32098:32098:0802/091823.219525:INFO:remote_commands_invalidator.cc(57)] Starting RemoteCommandsInvalidator.
[32098:32098:0802/091823.219583:INFO:remote_commands_invalidator.cc(123)] RemoteCommandsInvalidator ReloadPolicyData.
[32098:32098:0802/091823.219617:INFO:remote_commands_invalidator.cc(167)] Unregister RemoteCommandsInvalidator.
[ash:32128:32128:0802/091823.266685:ERROR:shell_delegate_mash.cc(51)] Not implemented reached in virtual bool ash::ShellDelegateMash::CanShowWindowForUser(aura::Window *) const
[ash:32128:32128:0802/091823.267413:ERROR:server_window.cc(458)] Not implemented reached in void ui::ws2::ServerWindow::SetClientArea(const gfx::Insets &, const std::vector<gfx::Rect> &)
[ash:32128:32128:0802/091823.267446:ERROR:window_tree.cc(1346)] Not implemented reached in virtual void ui::ws2::WindowTree::SetHitTestMask(ui::Id, const base::Optional<gfx::Rect> &)
[32098:32098:0802/091823.273540:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[32098:32098:0802/091823.273559:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[32098:32098:0802/091823.273564:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[32098:32098:0802/091823.273588:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[32098:32098:0802/091823.273593:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[32098:32098:0802/091823.273597:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[32098:32098:0802/091823.273601:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[32098:32098:0802/091823.273605:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[32098:32098:0802/091823.273609:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[32098:32098:0802/091823.273631:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[32098:32098:0802/091823.273636:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[32098:32098:0802/091823.273640:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[32098:32098:0802/091823.329613:ERROR:layer_tree_host_impl.cc(2997)] Forcing zero-copy tile initialization as worker context is missing
[32098:32098:0802/091823.330769:ERROR:remote_text_input_client.cc(139)] Not implemented reached in virtual void RemoteTextInputClient::OnInputMethodChanged()
[32098:32098:0802/091823.330793:ERROR:remote_text_input_client.cc(96)] Not implemented reached in virtual ui::TextInputClient::FocusReason RemoteTextInputClient::GetFocusReason() const
[32098:32098:0802/091823.330798:ERROR:remote_text_input_client.cc(181)] Not implemented reached in virtual bool RemoteTextInputClient::ShouldDoLearning()
[32098:32098:0802/091823.330813:ERROR:remote_text_input_client.cc(90)] Not implemented reached in virtual bool RemoteTextInputClient::HasCompositionText() const
[32098:32098:0802/091823.330818:ERROR:remote_text_input_client.cc(102)] Not implemented reached in virtual bool RemoteTextInputClient::GetTextRange(gfx::Range *) const
[32098:32098:0802/091823.330824:ERROR:remote_text_input_client.cc(157)] Not implemented reached in virtual void RemoteTextInputClient::EnsureCaretNotInRect(const gfx::Rect &)
[32098:32098:0802/091823.354966:ERROR:layer_tree_host_impl.cc(2997)] Forcing zero-copy tile initialization as worker context is missing
[32098:32098:0802/091823.368876:ERROR:render_widget_host_view_aura.cc(1231)] Not implemented reached in virtual base::i18n::TextDirection content::RenderWidgetHostViewAura::GetTextDirection() const
[32098:32098:0802/091823.411408:INFO:CONSOLE(0)] "[DOM] Input elements should have autocomplete attributes (suggested: "current-password"): (More info: https://goo.gl/9p2vKq) %o", source: http://127.0.0.1:42005/password/password_fetch_submit.html (0)
[32098:32098:0802/091823.411451:INFO:CONSOLE(0)] "[DOM] Input elements should have autocomplete attributes (suggested: "username"): (More info: https://goo.gl/9p2vKq) %o", source: http://127.0.0.1:42005/password/password_fetch_submit.html (0)
[32098:32175:0802/091823.419290:WARNING:embedded_test_server.cc(238)] Request not handled. Returning 404: /favicon.ico
[1:8:0802/091823.436348:ERROR:layer_tree_host_impl.cc(2997)] Forcing zero-copy tile initialization as worker context is missing
../../chrome/browser/password_manager/password_manager_browsertest.cc:837: Failure
Value of: prompt_observer->IsSavePromptShownAutomatically()
  Actual: false
Expected: true
Stack trace:
#0 0x000001fe6b8c testing::internal::UnitTestImpl::CurrentOsStackTraceExceptTop()
#1 0x000001fe6569 testing::internal::AssertHelper::operator=()
#2 0x000000a3258c password_manager::PasswordManagerBrowserTestWithViewsFeature_PromptForFetchSubmitWithoutNavigation_Test::RunTestOnMainThread()
#3 0x00000413b08b content::BrowserTestBase::ProxyRunTestOnMainThreadLoop()
#4 0x000003d4a3fa ChromeBrowserMainParts::PreMainMessageLoopRunImpl()
#5 0x000003d49341 ChromeBrowserMainParts::PreMainMessageLoopRun()
#6 0x000001c00e45 chromeos::ChromeBrowserMainPartsChromeos::PreMainMessageLoopRun()
#7 0x00000295a051 content::BrowserMainLoop::PreMainMessageLoopRun()
#8 0x000002cbf8e7 content::StartupTaskRunner::RunAllTasksNow()
#9 0x000002958a3d content::BrowserMainLoop::CreateStartupTasks()
#10 0x00000295c4c3 content::BrowserMainRunnerImpl::Initialize()
#11 0x000002956a44 content::BrowserMain()
#12 0x000003b8d41c content::ContentMainRunnerImpl::Run()
#13 0x0000057ada30 service_manager::Main()
#14 0x000003b8b884 content::ContentMain()
#15 0x00000413acc2 content::BrowserTestBase::SetUp()
#16 0x000003cf9b4e InProcessBrowserTest::SetUp()

[32098:32098:0802/091823.584060:ERROR:layer_tree_host_impl.cc(2997)] Forcing zero-copy tile initialization as worker context is missing
[32098:32098:0802/091823.595118:ERROR:test_password_store.cc(198)] Not implemented reached in virtual void password_manager::TestPasswordStore::AddSiteStatsImpl(const password_manager::InteractionsStats &)
[32098:32098:0802/091823.654149:INFO:remote_commands_invalidator.cc(45)] Shutdown RemoteCommandsInvalidator.
[32098:32098:0802/091823.654227:INFO:remote_commands_invalidator.cc(68)] Stopping RemoteCommandsInvalidator.
[32098:32098:0802/091823.654244:INFO:remote_commands_invalidator.cc(167)] Unregister RemoteCommandsInvalidator.
[32098:32098:0802/091823.670645:WARNING:pref_notifier_impl.cc(23)] Pref observer found at shutdown.
[32098:32098:0802/091823.672130:WARNING:pref_notifier_impl.cc(23)] Pref observer found at shutdown.
[  FAILED  ] All/PasswordManagerBrowserTestWithViewsFeature.PromptForFetchSubmitWithoutNavigation/0, where GetParam() = false (646 ms)

 Issue 873299  has been merged into this issue.

Note that a bunch of tests seem to be flaking togther:

All/PasswordManagerBrowserTestWithViewsFeature.PromptForPushStateWhenFormDisappears/1
All/PasswordManagerBrowserTestWithViewsFeature.ChangePwdFormPushStateBubbleShown/1
CrControlledButtonTest.All
CrSettingsSiteListTest.EditExceptionDialog
BrowsingDataRemoverBrowserTest.HistoryDeletion
CrExtensionsNavigationHelperTest.SupportedRoutes
CrSettingsCategoryDefaultSettingTest.All
MaterialHistoryRoutingTest.All
All/PasswordManagerBrowserTestWithViewsFeature.PromptForPushStateWhenFormDisappears_ParametersInOrigins/1
WebUIImplBrowserTest.SameDocumentNavigationsAndReload
SecurityStateTabHelperTest.ConsoleMessageNotPrintedForPushStateNavigation/1

Not sure if they're all related, but suspect some of them are.

Oops, sample failures - https://ci.chromium.org/p/chromium/builders/luci.chromium.try/win7_chromium_rel_ng/59883

@10: CrSettings/CrExtensions and other mocha bugs are tracked in  bug 871692 .  I would love to find a common cause to all this stuff...