Running content_unittests with --single-process-tests, or --test-launcher-batch-limit=100 results in:

For example:

[----------] 16 tests from OneShotAccessibilityTreeSearchTest
[ RUN      ] OneShotAccessibilityTreeSearchTest.GetAll
[       OK ] OneShotAccessibilityTreeSearchTest.GetAll (3 ms)
[ RUN      ] OneShotAccessibilityTreeSearchTest.NoCycle
[29602:29602:0825/165501.661210:2185169553453:FATAL:task_scheduler_impl.cc(45)] Check failed: join_for_testing_returned_.IsSet(). 
#0 0x7f9669c2e74d base::debug::StackTrace::StackTrace()
#1 0x7f9669c2cb1c base::debug::StackTrace::StackTrace()
#2 0x7f9669cbd07a logging::LogMessage::~LogMessage()
#3 0x7f9669e36a4d base::internal::TaskSchedulerImpl::~TaskSchedulerImpl()
#4 0x7f9669e36d59 base::internal::TaskSchedulerImpl::~TaskSchedulerImpl()
#5 0x7f9669e35cfe base::TaskScheduler::SetInstance()
#6 0x7f9669e35b1e base::TaskScheduler::Create()
#7 0x7f9669e355ee base::TaskScheduler::CreateAndStartWithDefaultParams()
#8 0x0000006f66ed content::OneShotAccessibilityTreeSearchTest::SetUp()
#9 0x00000127c80e _ZN7testing8internal12InvokeHelperIdNSt3__15tupleIJEEEE12InvokeMethodIN5media23VirtualAudioInputStreamEMS8_FdvEEEdPT_T0_RKS4_
#10 0x000002556152 testing::internal::HandleExceptionsInMethodIfSupported<>()
#11 0x000002540cd4 testing::Test::Run()
#12 0x00000254187d testing::TestInfo::Run()
#13 0x0000025422dc testing::TestCase::Run()
#14 0x00000254df0c testing::internal::UnitTestImpl::RunAllTests()
#15 0x00000127ba8e _ZN7testing8internal12InvokeHelperIbNSt3__15tupleIJEEEE12InvokeMethodIN5media23VirtualAudioInputStreamEMS8_FbvEEEbPT_T0_RKS4_
#16 0x000002557692 testing::internal::HandleExceptionsInMethodIfSupported<>()
#17 0x00000254db4a testing::UnitTest::Run()
#18 0x000002e39311 RUN_ALL_TESTS()
#19 0x000002e36dee base::TestSuite::Run()
#20 0x000002d9a89d content::UnitTestTestSuite::Run()
#21 0x00000079fdad _ZN4base8internal13FunctorTraitsIMN7content26AppCacheRequestHandlerTestEFvvEvE6InvokeIPS3_JEEEvS5_OT_DpOT0_
#22 0x00000079fcf4 _ZN4base8internal12InvokeHelperILb0EvE8MakeItSoIMN7content26AppCacheRequestHandlerTestEFvvEJPS5_EEEvOT_DpOT0_
#23 0x00000202f4a5 _ZN4base8internal7InvokerINS0_9BindStateIMN7content17UnitTestTestSuiteEFivEJNS0_17UnretainedWrapperIS4_EEEEEFivEE7RunImplIRKS6_RKNSt3__15tupleIJS8_EEEJLm0EEEEiOT_OT0_NSF_16integer_sequenceImJXspT1_EEEE
#24 0x00000202f3ec _ZN4base8internal7InvokerINS0_9BindStateIMN7content17UnitTestTestSuiteEFivEJNS0_17UnretainedWrapperIS4_EEEEEFivEE3RunEPNS0_13BindStateBaseE
#25 0x0000007be99d _ZNKR4base8CallbackIFvvELNS_8internal8CopyModeE1ELNS2_10RepeatModeE1EE3RunEv
#26 0x000002e58937 base::(anonymous namespace)::LaunchUnitTestsInternal()
#27 0x000002e587a5 base::LaunchUnitTests()
#28 0x00000202f293 main
#29 0x7f9658e54f45 __libc_start_main