It's flaky, and here is one run: https://build.chromium.org/p/chromium.gpu.fyi/builders/Win7%20Release%20%28NVIDIA%29/builds/26192

Stack trace:

WebglConformance_conformance_textures_image_bitmap_from_image_bitmap_tex_2d_rgb_rgb_unsigned_byte (gpu_tests.webgl_conformance_integration_test.WebGLConformanceIntegrationTest) ... ASSERTION FAILED: is8Bit()
e:\b\build\slave\gpu_win_builder\build\src\third_party\webkit\source\wtf\text\stringimpl.h(225) : const unsigned char *__thiscall WTF::StringImpl::characters8(void) const
Backtrace:
	blink::WebCoreStringResource8::data [0x686054E6+42]
	v8::internal::String::GetFlatContent [0x68144AA2+354]
	v8::internal::String::IsOneByteEqualTo [0x6814E5E5+53]
	v8::internal::AstRawStringInternalizationKey::IsMatch [0x67DFC28A+26]
	v8::internal::HashTable<v8::internal::StringTable,v8::internal::StringTableShape,v8::internal::HashTableKey *>::FindEntry [0x681416CD+77]
	v8::internal::StringTable::LookupKey [0x6814F9E8+56]
	v8::internal::AstRawString::Internalize [0x67DFBEAF+63]
	v8::internal::AstValueFactory::Internalize [0x67DFC221+65]
	v8::internal::Parser::Internalize [0x6817D018+24]
	v8::internal::Parser::Parse [0x6817F92F+287]
	v8::internal::Parser::ParseStatic [0x6818C1E0+48]
	v8::internal::Compiler::GetSharedFunctionInfoForStreamedScript [0x67E8CA7F+495]
	v8::internal::Compiler::GetFunctionFromEval [0x67E8ACE5+1589]
	v8::internal::Compiler::Compile [0x67E87BFE+94]
	v8::internal::ActivationsFinder::VisitThread [0x681F2FDA+2138]
	v8::internal::Runtime_CompileLazy [0x681F1864+100]
	v8::internal::StackGuard::ThreadLocal::Initialize [0x68044AEB+523]
	WTF::StringImpl::operator delete [0x696A6A90+1303]
	blink::V8ScriptRunner::runCompiledScript [0x68604461+501]
	blink::V8ScriptRunner::compileScript [0x68603A01+200]
	blink::ScriptController::executeScriptAndReturnValue [0x685D2A39+481]
	blink::ScriptController::executeScriptInMainWorld [0x685D2FF3+44]
	blink::ScriptLoader::executeScript [0x687CEB14+1176]
	blink::ScriptLoader::prepareScript [0x687CFD5B+1023]
	blink::HTMLScriptRunner::runScript [0x688D3F0F+240]
	blink::HTMLScriptRunner::execute [0x688D2F4A+227]
	blink::HTMLDocumentParser::runScriptsForPausedTreeBuilder [0x688C744E+100]
	blink::HTMLDocumentParser::processParsedChunkFromBackgroundParser [0x688C69A9+1429]
	blink::HTMLDocumentParser::pumpPendingSpeculations [0x688C6C32+521]
	blink::HTMLDocumentParser::notifyScriptLoaded [0x688C6271+149]
	blink::HTMLScriptRunner::notifyFinished [0x688D3B8E+41]
	blink::PendingScript::streamingFinished [0x687C2462+94]
	blink::ScriptStreamer::notifyFinished [0x685DB4F7+152]
	blink::PendingScript::notifyFinished [0x687C22A1+327]
	blink::Resource::checkNotify [0x68A9C79B+47]
	blink::Resource::finish [0x68A9CFF0+143]
	blink::ResourceFetcher::didFinishLoading [0x68AA36ED+555]
	blink::ResourceLoader::didFinishLoading [0x68AA9080+54]
	content::WebURLLoaderImpl::Context::OnCompletedRequest [0x68540A95+302]
	content::WebURLLoaderImpl::RequestPeerImpl::OnCompletedRequest [0x68540AC6+32]
	content::ResourceDispatcher::OnRequestComplete [0x68531565+395]
	IPC::MessageT<ResourceMsg_RequestComplete_Meta,std::tuple<int,content::ResourceRequestCompletionStatus>,void>::Dispatch<content::ResourceDispatcher,content::ResourceDispatcher,void,void (__thiscall content::ResourceDispatcher::*)(int,content::ResourceRequ [0x6852F0BA+158]
	content::ResourceDispatcher::DispatchMessageW [0x685307B2+465]
	content::ResourceDispatcher::OnMessageReceived [0x68530BBE+313]
	std::_Tree<std::_Tmap_traits<enum gfx::Image::RepresentationType,std::unique_ptr<gfx::internal::ImageRep,std::default_delete<gfx::internal::ImageRep> >,std::less<enum gfx::Image::RepresentationType>,std::allocator<std::pair<enum gfx::Image::Representation [0x68532B66+81]
	scheduler::WebTaskRunnerImpl::runTask [0x69857579+11]
	base::internal::Invoker<base::internal::BindState<void (__cdecl*)(std::unique_ptr<blink::WebTaskRunner::Task,std::default_delete<blink::WebTaskRunner::Task> >),base::internal::PassedWrapper<std::unique_ptr<blink::WebTaskRunner::Task,std::default_delete<bl [0x698572DF+31]
	base::internal::Invoker<base::internal::BindState<void (__cdecl*)(std::unique_ptr<blink::WebTaskRunner::Task,std::default_delete<blink::WebTaskRunner::Task> >),base::internal::PassedWrapper<std::unique_ptr<blink::WebTaskRunner::Task,std::default_delete<bl [0x69857394+22]
	base::debug::TaskAnnotator::RunTask [0x69007A47+247]
	scheduler::TaskQueueManager::ProcessTaskFromWorkQueue [0x698609CB+562]
	scheduler::TaskQueueManager::DoWork [0x69860112+452]
	base::internal::FunctorTraits<void (__thiscall content::WebFileWriterBase::*)(__int64,bool),void>::Invoke<base::WeakPtr<content::WebFileWriterImpl>,__int64,bool> [0x6851DFDF+31]
	base::internal::InvokeHelper<1,void>::MakeItSo<void (__thiscall content::WebFileWriterBase::*const &)(__int64,bool),base::WeakPtr<content::WebFileWriterImpl>,__int64,bool> [0x6985F77A+35]
	base::internal::Invoker<base::internal::BindState<void (__thiscall scheduler::TaskQueueManager::*)(base::TimeTicks,bool),base::WeakPtr<scheduler::TaskQueueManager>,base::TimeTicks,bool>,void __cdecl(void)>::RunImpl<void (__thiscall scheduler::TaskQueueMan [0x6985F7B0+42]
	base::internal::Invoker<base::internal::BindState<void (__thiscall scheduler::TaskQueueManager::*)(base::TimeTicks,bool),base::WeakPtr<scheduler::TaskQueueManager>,base::TimeTicks,bool>,void __cdecl(void)>::Run [0x69860C53+22]
	base::debug::TaskAnnotator::RunTask [0x69007A47+247]
	base::MessageLoop::RunTask [0x68FB247B+1211]
	base::MessageLoop::DoWork [0x68FB164E+606]
	base::MessagePumpDefault::Run [0x690088A8+424]
	base::MessageLoop::RunHandler [0x68FB1FB7+103]
	base::RunLoop::Run [0x68FFA5C9+41]
	content::RendererMain [0x68E25F4D+509]