https://ci.chromium.org/buildbot/chromium.clang/ToTLinux/

Example failing builds:
https://ci.chromium.org/buildbot/chromium.clang/ToTLinux/3342
https://ci.chromium.org/buildbot/chromium.clang/ToTLinux/3339
https://ci.chromium.org/buildbot/chromium.clang/ToTLinux/3333

Snippet from logs:
[170/170] WebViewAPITest.TestWebRequestAPIWithHeaders (TIMED OUT)
Retrying 1 test (retry #3)
Still waiting for the following processes to finish:
	./extensions_browsertests --brave-new-test-launcher --cfi-diag=0 --data-path=/b/s/w/itQ60GFr/.org.chromium.Chromium.s2JVNT/dH76Kys --disable-gpu-process-for-dx12-vulkan-info-collection --enable-features=NetworkService --gtest_also_run_disabled_tests --gtest_filter=WebViewAPITest.TestWebRequestAPIWithHeaders --single_process --test-launcher-bot-mode --test-launcher-output=/b/s/w/itQ60GFr/.org.chromium.Chromium.s2JVNT/resultsFvdqih/test_results.xml --test-launcher-summary-output=/b/s/w/ioQgzB2V/output.json
Still waiting for the following processes to finish:
	./extensions_browsertests --brave-new-test-launcher --cfi-diag=0 --data-path=/b/s/w/itQ60GFr/.org.chromium.Chromium.s2JVNT/dH76Kys --disable-gpu-process-for-dx12-vulkan-info-collection --enable-features=NetworkService --gtest_also_run_disabled_tests --gtest_filter=WebViewAPITest.TestWebRequestAPIWithHeaders --single_process --test-launcher-bot-mode --test-launcher-output=/b/s/w/itQ60GFr/.org.chromium.Chromium.s2JVNT/resultsFvdqih/test_results.xml --test-launcher-summary-output=/b/s/w/ioQgzB2V/output.json
[ RUN      ] WebViewAPITest.TestWebRequestAPIWithHeaders
Xlib:  extension "RANDR" missing on display ":99".
DevTools listening on ws://127.0.0.1:42040/devtools/browser/02c48014-9ddb-49ea-be38-20c72851021f
BrowserTestBase received signal: Terminated. Backtrace:
#0 0x7f8ae7f8e05c base::debug::StackTrace::StackTrace()
#1 0x00000084e345 content::(anonymous namespace)::DumpStackTraceSignalHandler()
#2 0x7f8adf0fdcb0 <unknown>
#3 0x7f8adf1b7c9d __poll
#4 0x7f8adde2cfe4 <unknown>
#5 0x7f8adde2d0ec g_main_context_iteration
#6 0x7f8ae7ef9812 base::MessagePumpGlib::Run()
#7 0x7f8ae7f1e685 base::RunLoop::Run()
#8 0x0000008ae237 ExtensionTestMessageListener::WaitUntilSatisfied()
#9 0x0000004bba99 extensions::WebViewAPITest::RunTest()
#10 0x0000004c0968 extensions::WebViewAPITest_TestWebRequestAPIWithHeaders_Test::RunTestOnMainThread()
#11 0x00000084dbb8 content::BrowserTestBase::ProxyRunTestOnMainThreadLoop()
#12 0x000000687887 extensions::ShellBrowserMainParts::PreMainMessageLoopRun()
#13 0x7f8ae6f2b661 content::BrowserMainLoop::PreMainMessageLoopRun()
#14 0x7f8ae72bc0b7 content::StartupTaskRunner::RunAllTasksNow()
#15 0x7f8ae6f2a074 content::BrowserMainLoop::CreateStartupTasks()
#16 0x7f8ae6f2dfe3 content::BrowserMainRunnerImpl::Initialize()
#17 0x7f8ae6f27ef4 content::BrowserMain()
#18 0x7f8ae7721849 content::ContentMainRunnerImpl::Run()
#19 0x7f8adea7f6fb service_manager::Main()
#20 0x7f8ae771fbb1 content::ContentMain()
#21 0x00000084d7ac content::BrowserTestBase::SetUp()
#22 0x0000004cb762 extensions::AppShellTest::SetUp()
#23 0x00000066261d testing::Test::Run()
#24 0x000000662ec0 testing::TestInfo::Run()
#25 0x0000006633d7 testing::TestCase::Run()
#26 0x00000066eda7 testing::internal::UnitTestImpl::RunAllTests()
#27 0x00000066e91d testing::UnitTest::Run()
#28 0x00000085be91 base::TestSuite::Run()
#29 0x0000004cb82c extensions::AppShellTestLauncherDelegate::RunTestSuite()
#30 0x000000851434 content::LaunchTests()
#31 0x0000004cb9a4 main
#32 0x7f8adf0e8f45 __libc_start_main
#33 0x00000047f02a _start
[171/171] WebViewAPITest.TestWebRequestAPIWithHeaders (TIMED OUT)

On builds between failures, the test takes about 1800ms to run.