This is almost certainly caused by r431064. I'd revert immediately, but it looks like r431114 depends on it and has already landed, so this might get complicated.

First failing build: https://build.chromium.org/p/chromium.gpu.fyi/builders/Win8%20Release%20%28NVIDIA%29/builds/25185



WebglConformance_conformance_textures_video_tex_2d_rgba_rgba_unsigned_short_5_5_5_1 (gpu_tests.webgl_conformance_integration_test.WebGLConformanceIntegrationTest) ... [1444:3144:1109/184905:ERROR:ssl_client_socket_impl.cc(1082)] handshake failed; returned -1, SSL error code 1, net_error -100
[3632:3408:1109/184905:INFO:gpu_video_decode_accelerator_factory.cc(163)] Initializing DXVA HW decoder for windows.
[3632:3408:1109/184905:FATAL:gpu_video_decode_accelerator.cc(525)] Check failed: texture_ref->texture()->IsLevelCleared(target, 0). 
Backtrace:
	base::debug::StackTrace::StackTrace [0x6A0C7237+23]
	logging::LogMessage::~LogMessage [0x6A06EF71+49]
	media::GpuVideoDecodeAccelerator::SetTextureCleared [0x6A92B6CF+336]
	media::GpuVideoDecodeAccelerator::PictureReady [0x6A92B157+66]
	media::DXVAVideoDecodeAccelerator::NotifyPictureReady [0x6A7BFBBD+171]
	media::DXVAVideoDecodeAccelerator::CopySurfaceComplete [0x6A7B8DF7+573]
	Invoke<base::WeakPtr<media::DXVAVideoDecodeAccelerator> const &,base::internal::FunctorTraits<void (__thiscall media::DXVAVideoDecodeAccelerator::*)(IDirect3DSurface9 *,IDirect3DSurface9 *,int,int),void>::$TAB$$TABHABH const &,void * const volatile,void ( [0x6A7B6646+36]
	MakeItSo<void (__thiscall media::DXVAVideoDecodeAccelerator::*const &)(IDirect3DSurface9 *,IDirect3DSurface9 *,int,int),base::WeakPtr<media::DXVAVideoDecodeAccelerator> const &,base::internal::InvokeHelper<1,void>::$TAB$$TABHABH const &,void * const volat [0x6A7B66E5+40]
	??$RunImpl@ABQ8DXVAVideoDecodeAccelerator@media@@AEXPAUIDirect3DSurface9@@0HH@ZABV?$tuple@V?$WeakPtr@VDXVAVideoDecodeAccelerator@media@@@base@@$$T$$THH@std@@$0A@$00$01$02$03@?$Invoker@U?$BindState@P8DXVAVideoDecodeAccelerator@media@@AEXPAUIDirect3DSurface [0x6A7B7147+31]
	?Run@?$Invoker@U?$BindState@P8DXVAVideoDecodeAccelerator@media@@AEXPAUIDirect3DSurface9@@0HH@ZV?$WeakPtr@VDXVAVideoDecodeAccelerator@media@@@base@@$$T$$THH@internal@base@@$$A6AXXZ@internal@base@@SAXPAVBindStateBase@23@@Z [0x6A7C1133+22]
	base::debug::TaskAnnotator::RunTask [0x6A0E0718+280]
	base::MessageLoop::RunTask [0x6A0A709C+1228]
	base::MessageLoop::DoWork [0x6A0A60A3+611]
	base::MessagePumpDefault::Run [0x6A0E26A0+416]
	base::MessageLoop::RunHandler [0x6A0A6BC1+305]
	base::RunLoop::Run [0x6A0B5B69+41]
	content::GpuMain [0x6A9249B5+748]
	content::RunNamedProcessTypeMain [0x6A058591+176]
	content::ContentMainRunnerImpl::Run [0x6A0584B0+274]
	content::ContentMain [0x6A057931+35]
	ChromeMain [0x6969953E+158]
	MainDllLoader::Launch [0x00074C7E+527]
	wWinMain [0x00072954+342]
	__scrt_common_main_seh [0x000BD528+246] (f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253)
	BaseThreadInitThunk [0x76D57C04+36]
	RtlInitializeExceptionChain [0x7703AD1F+143]
	RtlInitializeExceptionChain [0x7703ACEA+90]
	(No symbol) [0x00000000]