On Windows 10, chrome version 67.0.3388.0

Running "chrome.exe --trace-startup" causes a DCHECK to trigger immediately. It looks like the DCHECK_CURRENTLY_ON(BrowserThread::UI) inside BrowserMainLoop::GetInstance() is failing.

Stacktrace:
>	base.dll!base::debug::BreakDebugger() Line 21	C++
 	base.dll!logging::LogMessage::~LogMessage() Line 857	C++
 	content.dll!content::BrowserMainLoop::GetInstance() Line 574	C++
 	content.dll!content::BrowserChildProcessHostImpl::CopyTraceStartupFlags(base::CommandLine * cmd_line) Line 220	C++
 	content.dll!content::GpuProcessHost::LaunchGpuProcess() Line 1225	C++
 	content.dll!content::GpuProcessHost::Init() Line 782	C++
 	content.dll!content::GpuProcessHost::Get(content::GpuProcessHost::GpuProcessKind kind, bool force_create) Line 489	C++
 	content.dll!content::BrowserGpuChannelHostFactory::EstablishRequest::EstablishOnIO() Line 117	C++
 	content.dll!base::internal::FunctorTraits<void (content::BrowserGpuChannelHostFactory::EstablishRequest::*)() __attribute__((thiscall)),void>::Invoke<scoped_refptr<content::BrowserGpuChannelHostFactory::EstablishRequest>>(void(content::BrowserGpuChannelHostFactory::EstablishRequest::*)() method, scoped_refptr<content::BrowserGpuChannelHostFactory::EstablishRequest> && receiver_ptr) Line 447	C++
 	content.dll!base::internal::InvokeHelper<0,void>::MakeItSo<void (content::BrowserGpuChannelHostFactory::EstablishRequest::*)() __attribute__((thiscall)),scoped_refptr<content::BrowserGpuChannelHostFactory::EstablishRequest> >(void(content::BrowserGpuChannelHostFactory::EstablishRequest::*)() && functor, scoped_refptr<content::BrowserGpuChannelHostFactory::EstablishRequest> && args) Line 530	C++
 	content.dll!base::internal::Invoker<base::internal::BindState<void (content::BrowserGpuChannelHostFactory::EstablishRequest::*)() __attribute__((thiscall)),scoped_refptr<content::BrowserGpuChannelHostFactory::EstablishRequest> >,void ()>::RunImpl<void (content::BrowserGpuChannelHostFactory::EstablishRequest::*)() __attribute__((thiscall)),std::tuple<scoped_refptr<content::BrowserGpuChannelHostFactory::EstablishRequest> >,0>(void(content::BrowserGpuChannelHostFactory::EstablishRequest::*)() && functor, std::tuple<scoped_refptr<content::BrowserGpuChannelHostFactory::EstablishRequest> > && bound, std::integer_sequence<unsigned int,0>) Line 604	C++
 	content.dll!base::internal::Invoker<base::internal::BindState<void (content::BrowserGpuChannelHostFactory::EstablishRequest::*)() __attribute__((thiscall)),scoped_refptr<content::BrowserGpuChannelHostFactory::EstablishRequest> >,void ()>::RunOnce(base::internal::BindStateBase * base) Line 572	C++
 	base.dll!base::OnceCallback<void ()>::Run() Line 96	C++
 	base.dll!base::debug::TaskAnnotator::RunTask(const char * queue_function, base::PendingTask * pending_task) Line 62	C++
 	base.dll!base::internal::IncomingTaskQueue::RunTask(base::PendingTask * pending_task) Line 124	C++
 	base.dll!base::MessageLoop::RunTask(base::PendingTask * pending_task) Line 391	C++
 	base.dll!base::MessageLoop::DeferOrRunPendingTask(base::PendingTask pending_task) Line 406	C++
 	base.dll!base::MessageLoop::DoWork() Line 447	C++
 	base.dll!base::MessagePumpForIO::DoRunLoop() Line 481	C++
 	base.dll!base::MessagePumpWin::Run(base::MessagePump::Delegate * delegate) Line 59	C++
 	base.dll!base::MessageLoop::Run(bool application_tasks_allowed) Line 342	C++
 	base.dll!base::RunLoop::Run() Line 130	C++
 	base.dll!base::Thread::Run(base::RunLoop * run_loop) Line 255	C++
 	content.dll!content::BrowserProcessSubThread::IOThreadRun(base::RunLoop * run_loop) Line 155	C++
 	content.dll!content::BrowserProcessSubThread::Run(base::RunLoop * run_loop) Line 105	C++
 	base.dll!base::Thread::ThreadMain() Line 338	C++
 	base.dll!base::`anonymous namespace'::ThreadFunc(void * params) Line 93	C++