It's flaky on Mac.

../../chrome/browser/ui/keyboard_lock_interactive_browsertest.cc:340: Failure
Value of: IsInBrowserFullscreen()
  Actual: false
Expected: true
Stack trace:
0   libbase.dylib                       0x00000001294fc32c base::debug::StackTrace::StackTrace() + 28
1   interactive_ui_tests                0x000000010b1070aa StackTraceGetter::CurrentStackTrace(int, int) + 90
2   interactive_ui_tests                0x000000010b12afb7 testing::internal::UnitTestImpl::CurrentOsStackTraceExceptTop(int) + 71
3   interactive_ui_tests                0x000000010b12a32b testing::internal::AssertHelper::operator=(testing::Message const&) const + 139
4   interactive_ui_tests                0x000000010ae3e415 KeyboardLockInteractiveBrowserTest_RequestedButNotActiveInBrowserFullscreen_Test::RunTestOnMainThread() + 5141
5   interactive_ui_tests                0x000000010fd98624 content::BrowserTestBase::ProxyRunTestOnMainThreadLoop() + 2116
6   interactive_ui_tests                0x000000010fd9aa8d void base::internal::FunctorTraits<void (content::BrowserTestBase::*)(), void>::Invoke<void (content::BrowserTestBase::*)(), content::BrowserTestBase*>(void (content::BrowserTestBase::*)(), content::BrowserTestBase*&&) + 125
7   interactive_ui_tests                0x000000010fd9a9d4 void base::internal::InvokeHelper<false, void>::MakeItSo<void (content::BrowserTestBase::* const&)(), content::BrowserTestBase*>(void (content::BrowserTestBase::* const&&&)(), content::BrowserTestBase*&&) + 68
8   interactive_ui_tests                0x000000010fd9a963 void base::internal::Invoker<base::internal::BindState<void (content::BrowserTestBase::*)(), base::internal::UnretainedWrapper<content::BrowserTestBase> >, void ()>::RunImpl<void (content::BrowserTestBase::* const&)(), std::__1::tuple<base::internal::UnretainedWrapper<content::BrowserTestBase> > const&, 0ul>(void (content::BrowserTestBase::* const&&&)(), std::__1::tuple<base::internal::UnretainedWrapper<content::BrowserTestBase> > const&&&, std::__1::integer_sequence<unsigned long, 0ul>) + 99
9   interactive_ui_tests                0x000000010fd9a89c base::internal::Invoker<base::internal::BindState<void (content::BrowserTestBase::*)(), base::internal::UnretainedWrapper<content::BrowserTestBase> >, void ()>::Run(base::internal::BindStateBase*) + 44
10  interactive_ui_tests                0x000000010ac7349d base::RepeatingCallback<void ()>::Run() const & + 61
11  interactive_ui_tests                0x000000010e1b3076 ChromeBrowserMainParts::PreMainMessageLoopRunImpl() + 8582
12  interactive_ui_tests                0x000000010e1b0e3a ChromeBrowserMainParts::PreMainMessageLoopRun() + 250
13  libcontent.dylib                    0x000000012d60a551 content::BrowserMainLoop::PreMainMessageLoopRun() + 337
14  libcontent.dylib                    0x000000012d61102d int base::internal::FunctorTraits<int (content::BrowserMainLoop::*)(), void>::Invoke<int (content::BrowserMainLoop::*)(), content::BrowserMainLoop*>(int (content::BrowserMainLoop::*)(), content::BrowserMainLoop*&&) + 125
15  libcontent.dylib                    0x000000012d610f74 int base::internal::InvokeHelper<false, int>::MakeItSo<int (content::BrowserMainLoop::* const&)(), content::BrowserMainLoop*>(int (content::BrowserMainLoop::* const&&&)(), content::BrowserMainLoop*&&) + 68
16  libcontent.dylib                    0x000000012d610f03 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
17  libcontent.dylib                    0x000000012d610e0c base::internal::Invoker<base::internal::BindState<int (content::BrowserMainLoop::*)(), base::internal::UnretainedWrapper<content::BrowserMainLoop> >, int ()>::Run(base::internal::BindStateBase*) + 44
18  libcontent.dylib                    0x000000012e1520dd base::RepeatingCallback<int ()>::Run() const & + 61
19  libcontent.dylib                    0x000000012eb460c0 content::StartupTaskRunner::RunAllTasksNow() + 528
20  libcontent.dylib                    0x000000012d6056c1 content::BrowserMainLoop::CreateStartupTasks() + 2769
21  libcontent.dylib                    0x000000012d614c12 content::BrowserMainRunnerImpl::Initialize(content::MainFunctionParams const&, std::__1::unique_ptr<content::BrowserProcessSubThread, std::__1::default_delete<content::BrowserProcessSubThread> >) + 3138
22  libcontent.dylib                    0x000000012d5fcf61 content::BrowserMain(content::MainFunctionParams const&, std::__1::unique_ptr<content::BrowserProcessSubThread, std::__1::default_delete<content::BrowserProcessSubThread> >) + 993
23  libcontent.dylib                    0x0000000130414183 content::RunBrowserProcessMain(content::MainFunctionParams const&, content::ContentMainDelegate*, std::__1::unique_ptr<content::BrowserProcessSubThread, std::__1::default_delete<content::BrowserProcessSubThread> >) + 1027
24  libcontent.dylib                    0x0000000130416f27 content::ContentMainRunnerImpl::Run() + 2023
25  libcontent.dylib                    0x000000013040c3c5 content::ContentServiceManagerMainDelegate::RunEmbedderProcess() + 53
26  libembedder.dylib                   0x000000013fc2a958 service_manager::Main(service_manager::MainParams const&) + 2168
27  libcontent.dylib                    0x0000000130413d36 content::ContentMain(content::ContentMainParams const&) + 86
28  interactive_ui_tests                0x000000010fd97a60 content::BrowserTestBase::SetUp() + 8128
29  interactive_ui_tests                0x000000010dfe9e08 InProcessBrowserTest::SetUp() + 2696

Example failed builds
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.13%20Tests%20%28dbg%29/2847

https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.13%20Tests%20%28dbg%29/2851