Many tests timed out, please see:

https://logs.chromium.org/v/?s=chromium%2Fbuildbucket%2Fcr-buildbucket.appspot.com%2F8943662002649188512%2F%2B%2Fsteps%2Fsync_integration_tests_on_Windows-10-15063%2F0%2Fstdout

https://logs.chromium.org/v/?s=chromium%2Fbuildbucket%2Fcr-buildbucket.appspot.com%2F8943683236485883120%2F%2B%2Fsteps%2Fsync_integration_tests_on_Windows-10-15063%2F0%2Fstdout

https://logs.chromium.org/v/?s=chromium%2Fbuildbucket%2Fcr-buildbucket.appspot.com%2F8943687813381294048%2F%2B%2Fsteps%2Fsync_integration_tests_on_Windows-10-15063%2F0%2Fstdout

https://logs.chromium.org/v/?s=chromium%2Fbuildbucket%2Fcr-buildbucket.appspot.com%2F8943702788022042896%2F%2B%2Fsteps%2Fsync_integration_tests_on_Windows-10-15063%2F0%2Fstdout

These failures look session related.

Mikel, any ideas?

Looks like the failures are perhaps flaky. Removing from the sheriffing queue and assigning an owner.

I couldn't look into this yet.

These are still very flaky. Certain set of tests fail or timeout altogether:

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=sync_integration_tests&builder=chromium.win%3AWin10%20Tests%20x64%20(dbg)

Sample stack:

../../chrome/browser/sync/test/integration/sync_test.cc(1110): error: Expected equality of these values:
  "Notifications disabled"
  base::UTF16ToASCII( browser()->tab_strip_model()->GetActiveWebContents()-> GetTitle())
    Which is: ""
Stack trace:
Backtrace:
	StackTraceGetter::CurrentStackTrace [0x00007FF78658BBB0+80]
	testing::internal::UnitTestImpl::CurrentOsStackTraceExceptTop [0x00007FF7865A698A+90]
	testing::internal::AssertHelper::operator= [0x00007FF7865A648A+90]
	SyncTest::DisableNotificationsImpl [0x00007FF78912366D+781]
	SyncTest::DisableNotifications [0x00007FF789123733+19]
	base::circular_deque<syncer::EnumSet<enum syncer::ModelType,2,41> >::~circular_deque<syncer::EnumSet<enum syncer::ModelType,2,41> > [0x00007FF7863BFDAE+206]
	std::_Vector_alloc<std::_Vec_base_types<std::unique_ptr<MigrationWatcher,std::default_delete<MigrationWatcher> >,std::allocator<std::unique_ptr<MigrationWatcher,std::default_delete<MigrationWatcher> > > > >::_Free_proxy [0x00007FF7863BFC58+552]
	base::circular_deque<syncer::EnumSet<enum syncer::ModelType,2,41> >::front [0x00007FF7863C716E+1038]
	content::BrowserTestBase::ProxyRunTestOnMainThreadLoop [0x00007FF789DA706B+811]
	??$Invoke@P8BrowserTestBase@content@@EAAXXZPEAV12@$$V@?$FunctorTraits@P8BrowserTestBase@content@@EAAXXZX@internal@base@@SAXP8BrowserTestBase@content@@EAAXXZ$$QEAPEAV34@@Z [0x00007FF789DA966A+26]
	base::internal::InvokeHelper<0,void>::MakeItSo<void (__cdecl content::BrowserTestBase::*const & __ptr64)(void) __ptr64,content::BrowserTestBase * __ptr64> [0x00007FF789DA95E4+52]
	base::internal::Invoker<base::internal::BindState<void (__cdecl content::BrowserTestBase::*)(void) __ptr64,base::internal::UnretainedWrapper<content::BrowserTestBase> >,void __cdecl(void)>::RunImpl<void (__cdecl content::BrowserTestBase::*const & __ptr64) [0x00007FF789DA9598+88]
	base::internal::Invoker<base::internal::BindState<void (__cdecl content::BrowserTestBase::*)(void) __ptr64,base::internal::UnretainedWrapper<content::BrowserTestBase> >,void __cdecl(void)>::Run [0x00007FF789DA94AC+60]
	base::RepeatingCallback<void __cdecl(void)>::Run [0x00007FF7866F6852+66]
	ChromeBrowserMainParts::PreMainMessageLoopRunImpl [0x00007FF78A0A2AA4+6820]
	ChromeBrowserMainParts::PreMainMessageLoopRun [0x00007FF78A0A0F61+465]
	content::BrowserMainLoop::PreMainMessageLoopRun [0x00007FFD98AED3A3+355]
	??$Invoke@P8BrowserMainLoop@content@@EAAHXZPEAV12@$$V@?$FunctorTraits@P8BrowserMainLoop@content@@EAAHXZX@internal@base@@SAHP8BrowserMainLoop@content@@EAAHXZ$$QEAPEAV34@@Z [0x00007FFD98AF734A+26]
	base::internal::InvokeHelper<0,int>::MakeItSo<int (__cdecl content::BrowserMainLoop::*const & __ptr64)(void) __ptr64,content::BrowserMainLoop * __ptr64> [0x00007FFD98AF72C4+52]
	base::internal::Invoker<base::internal::BindState<int (__cdecl content::BrowserMainLoop::*)(void) __ptr64,base::internal::UnretainedWrapper<content::BrowserMainLoop> >,int __cdecl(void)>::RunImpl<int (__cdecl content::BrowserMainLoop::*const & __ptr64)(vo [0x00007FFD98AF7268+88]
	base::internal::Invoker<base::internal::BindState<int (__cdecl content::BrowserMainLoop::*)(void) __ptr64,base::internal::UnretainedWrapper<content::BrowserMainLoop> >,int __cdecl(void)>::Run [0x00007FFD98AF713C+60]
	base::RepeatingCallback<int __cdecl(void)>::Run [0x00007FFD99548CF2+66]
	content::StartupTaskRunner::RunAllTasksNow [0x00007FFD99F230C1+161]
	content::BrowserMainLoop::CreateStartupTasks [0x00007FFD98AEB2D1+1441]
	content::BrowserMainRunnerImpl::Initialize [0x00007FFD98AFD4D8+1864]
	content::BrowserMain [0x00007FFD98AE4972+194]
	content::RunBrowserProcessMain [0x00007FFD9B7E2CC8+168]
	content::ContentMainRunnerImpl::Run [0x00007FFD9B7E3FE7+935]
	content::ContentServiceManagerMainDelegate::RunEmbedderProcess [0x00007FFD9B7E0387+55]
	service_manager::Main [0x00007FFDA50250B2+1762]
	content::ContentMain [0x00007FFD9B7E2B8F+95]
	content::BrowserTestBase::SetUp [0x00007FF789DA69FB+2875]
	InProcessBrowserTest::SetUp [0x00007FF78913EF8E+1998]
	SyncTest::SetUp [0x00007FF78911A386+710]

Optimistically duping