All interactive_ui_tests are failing with this error on  Mac10.13 Tests (dbg) since build 877:

[ RUN      ] ExtensionCrashRecoveryTest.ShutdownWhileCrashed
[2871:4611:0328/171848.660071:WARNING:notification_platform_bridge_mac.mm(511)] AlertNotificationService: XPC connection invalidated.
2018-03-28 17:18:48.876 interactive_ui_tests[2871:2981470] *** Owner supplied to -[NSTrackingArea initWithRect:options:owner:userInfo:] referenced a deallocating object. Tracking area behavior is undefined. Break on NSTrackingAreaDeallocatingOwnerError to debug.
[2876:775:0328/171848.893462:WARNING:vt_video_decode_accelerator_mac.cc(177)] Failed to create VTDecompressionSession: Error Domain=NSOSStatusErrorDomain Code=-8973 "codecOpenErr" (-8973)
[2876:775:0328/171848.894203:WARNING:vt_video_decode_accelerator_mac.cc(199)] Failed to create hardware VideoToolbox session
Received signal 11 SEGV_MAPERR 000000000000
[2876:775:0328/171848.959286:ERROR:vt_video_encode_accelerator_mac.cc(517)]  VTCompressionSessionCreate failed: -12908
0   libbase.dylib                       0x00000001293c753e base::debug::StackTrace::StackTrace(unsigned long) + 174
1   libbase.dylib                       0x00000001293c75fd base::debug::StackTrace::StackTrace(unsigned long) + 29
2   libbase.dylib                       0x00000001293c5aac base::debug::StackTrace::StackTrace() + 28
3   libbase.dylib                       0x00000001293c732f base::debug::(anonymous namespace)::StackDumpSignalHandler(int, __siginfo*, void*) + 1407
4   libsystem_platform.dylib            0x00007fff609d3f5a _sigtramp + 26
5   ???                                 0x00007ffee46ed4e8 0x0 + 140732730889448
6   interactive_ui_tests                0x000000010c58343a extensions::ExtensionRegistryFactory::GetBrowserContextToUse(content::BrowserContext*) const + 42
7   libkeyed_service_content.dylib      0x0000000142532083 BrowserContextKeyedServiceFactory::GetContextToUse(base::SupportsUserData*) const + 67
8   libkeyed_service_core.dylib         0x0000000140df7af5 KeyedServiceFactory::GetServiceForContext(base::SupportsUserData*, bool) + 341
9   libkeyed_service_content.dylib      0x0000000142531ce7 BrowserContextKeyedServiceFactory::GetServiceForBrowserContext(content::BrowserContext*, bool) + 55
10  interactive_ui_tests                0x000000010c583292 extensions::ExtensionRegistryFactory::GetForBrowserContext(content::BrowserContext*) + 34
11  interactive_ui_tests                0x000000010c57d3c5 extensions::ExtensionRegistry::Get(content::BrowserContext*) + 21
12  interactive_ui_tests                0x0000000112e86ff3 extensions::ChromeContentBrowserClientExtensionsPart::SiteInstanceGotProcess(content::SiteInstance*) + 83
13  interactive_ui_tests                0x000000010e85691e ChromeContentBrowserClient::SiteInstanceGotProcess(content::SiteInstance*) + 526
14  libcontent.dylib                    0x000000012e349288 content::SiteInstanceImpl::GetProcess() + 936
15  libcontent.dylib                    0x000000012e442f7f content::WebContentsImpl::Init(content::WebContents::CreateParams const&) + 495
16  libcontent.dylib                    0x000000012e42a344 content::WebContentsImpl::CreateWithOpener(content::WebContents::CreateParams const&, content::RenderFrameHostImpl*) + 1060
17  libcontent.dylib                    0x000000012e429f0c content::WebContents::Create(content::WebContents::CreateParams const&) + 44
18  interactive_ui_tests                0x00000001144aea9f (anonymous namespace)::CreateTargetContents(NavigateParams const&, GURL const&) + 479
19  interactive_ui_tests                0x00000001144abad0 Navigate(NavigateParams*) + 2400
20  interactive_ui_tests                0x000000011455af14 StartupBrowserCreatorImpl::OpenTabsInBrowser(Browser*, bool, std::__1::vector<StartupTab, std::__1::allocator<StartupTab> > const&) + 1124
21  interactive_ui_tests                0x000000011455d4cc StartupBrowserCreatorImpl::RestoreOrCreateBrowser(std::__1::vector<StartupTab, std::__1::allocator<StartupTab> > const&, StartupBrowserCreatorImpl::BrowserOpenBehavior, unsigned int, bool, bool) + 1068
22  interactive_ui_tests                0x000000011455a1ff StartupBrowserCreatorImpl::DetermineURLsAndLaunch(bool, std::__1::vector<GURL, std::__1::allocator<GURL> > const&) + 1151
23  interactive_ui_tests                0x0000000114558f15 StartupBrowserCreatorImpl::Launch(Profile*, std::__1::vector<GURL, std::__1::allocator<GURL> > const&, bool) + 1397
24  interactive_ui_tests                0x000000011454f8cb StartupBrowserCreator::LaunchBrowser(base::CommandLine const&, Profile*, base::FilePath const&, chrome::startup::IsProcessStartup, chrome::startup::IsFirstRun) + 715
25  interactive_ui_tests                0x0000000114551e87 StartupBrowserCreator::LaunchBrowserForLastProfiles(base::CommandLine const&, base::FilePath const&, bool, Profile*, std::__1::vector<Profile*, std::__1::allocator<Profile*> > const&) + 231
26  interactive_ui_tests                0x000000011454f558 StartupBrowserCreator::ProcessCmdLineImpl(base::CommandLine const&, base::FilePath const&, bool, Profile*, std::__1::vector<Profile*, std::__1::allocator<Profile*> > const&) + 7480
27  interactive_ui_tests                0x000000011454d6e0 StartupBrowserCreator::Start(base::CommandLine const&, base::FilePath const&, Profile*, std::__1::vector<Profile*, std::__1::allocator<Profile*> > const&) + 304
28  interactive_ui_tests                0x000000010e84632d ChromeBrowserMainParts::PreMainMessageLoopRunImpl() + 7885
29  interactive_ui_tests                0x000000010e8443ba ChromeBrowserMainParts::PreMainMessageLoopRun() + 250
30  libcontent.dylib                    0x000000012cf1c831 content::BrowserMainLoop::PreMainMessageLoopRun() + 337
31  libcontent.dylib                    0x000000012cf2336d int base::internal::FunctorTraits<int (content::BrowserMainLoop::*)(), void>::Invoke<content::BrowserMainLoop*>(int (content::BrowserMainLoop::*)(), content::BrowserMainLoop*&&) + 125
32  libcontent.dylib                    0x000000012cf232b4 int base::internal::InvokeHelper<false, int>::MakeItSo<int (content::BrowserMainLoop::* const&)(), content::BrowserMainLoop*>(int (content::BrowserMainLoop::* const&&&)(), content::BrowserMainLoop*&&) + 68
33  libcontent.dylib                    0x000000012cf23243 int base::internal::Invoker<base::internal::BindState<int (content::BrowserMainLoop::*)(), base::internal::UnretainedWrapper<content::BrowserMainLoop> >, int ()>::RunImpl<int (content::BrowserMainLoop::* const&)(), std::__1::tuple<base::internal::UnretainedWrapper<content::BrowserMainLoop> > const&, 0ul>(int (content::BrowserMainLoop::* const&&&)(), std::__1::tuple<base::internal::UnretainedWrapper<content::BrowserMainLoop> > const&&&, std::__1::integer_sequence<unsigned long, 0ul>) + 99
34  libcontent.dylib                    0x000000012cf2314c base::internal::Invoker<base::internal::BindState<int (content::BrowserMainLoop::*)(), base::internal::UnretainedWrapper<content::BrowserMainLoop> >, int ()>::Run(base::internal::BindStateBase*) + 44
35  libcontent.dylib                    0x000000012e38259d base::RepeatingCallback<int ()>::Run() const & + 61
36  libcontent.dylib                    0x000000012e382470 content::StartupTaskRunner::RunAllTasksNow() + 528
37  libcontent.dylib                    0x000000012cf18691 content::BrowserMainLoop::CreateStartupTasks() + 2769
38  libcontent.dylib                    0x000000012cf263d0 content::BrowserMainRunnerImpl::Initialize(content::MainFunctionParams const&) + 2480
39  libcontent.dylib                    0x000000012cf0fd56 content::BrowserMain(content::MainFunctionParams const&) + 550
40  libcontent.dylib                    0x000000012fb97838 content::RunNamedProcessTypeMain(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, content::MainFunctionParams const&, content::ContentMainDelegate*) + 600
41  libcontent.dylib                    0x000000012fb98eda content::ContentMainRunnerImpl::Run() + 1322
42  libcontent.dylib                    0x000000012fb8fcb5 content::ContentServiceManagerMainDelegate::RunEmbedderProcess() + 53
43  libembedder.dylib                   0x000000013e753a20 service_manager::Main(service_manager::MainParams const&) + 2128
44  libcontent.dylib                    0x000000012fb975a6 content::ContentMain(content::ContentMainParams const&) + 86
45  interactive_ui_tests                0x0000000110384b71 content::BrowserTestBase::SetUp() + 8097
46  interactive_ui_tests                0x000000010e67e234 InProcessBrowserTest::SetUp() + 1940
47  interactive_ui_tests                0x000000010b61144e ExtensionBrowserTest::SetUp() + 238
48  interactive_ui_tests                0x000000010ba2297e void testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) + 126
49  interactive_ui_tests                0x000000010b9f4c82 void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) + 114
50  interactive_ui_tests                0x000000010b9f4b64 testing::Test::Run() + 116
51  interactive_ui_tests                0x000000010b9f5bd0 testing::TestInfo::Run() + 224
52  interactive_ui_tests                0x000000010b9f6f9f testing::TestCase::Run() + 239
53  interactive_ui_tests                0x000000010ba0b576 testing::internal::UnitTestImpl::RunAllTests() + 886
54  interactive_ui_tests                0x000000010ba259fe bool testing::internal::HandleSehExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) + 126
55  interactive_ui_tests                0x000000010ba0b182 bool testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) + 114
56  interactive_ui_tests                0x000000010ba0b05b testing::UnitTest::Run() + 395
57  interactive_ui_tests                0x000000011061d181 RUN_ALL_TESTS() + 17
58  interactive_ui_tests                0x000000011061c4cb base::TestSuite::Run() + 363
59  interactive_ui_tests                0x000000010b81d83f InteractiveUITestSuiteRunner::RunTestSuite(int, char**) + 79
60  interactive_ui_tests                0x000000010e656de3 ChromeTestLauncherDelegate::RunTestSuite(int, char**) + 51
61  interactive_ui_tests                0x00000001103c9e72 content::LaunchTests(content::TestLauncherDelegate*, unsigned long, int, char**) + 850
[end of stack trace]

Builder: https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.13%20Tests%20%28dbg%29?limit=200
First failing build: https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.13%20Tests%20%28dbg%29/877

I'm going to suspect https://chromium-review.googlesource.com/c/chromium/src/+/934311 as it's the CL in the blamelist that seems the most related, but the relation is still very unclear.