webkit_tests failing on chromium.webkit/WebKit Linux Trusty ASAN

Builders failed on: 
- WebKit Linux Trusty ASAN: 
  https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20Trusty%20ASAN


Stack trace from:
https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.webkit%2FWebKit_Linux_Trusty_ASAN%2F2003%2F%2B%2Frecipes%2Fsteps%2Fwebkit_tests%2F0%2Fstdout

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15:36:04.074 23860   ==1==ERROR: AddressSanitizer: container-overflow on address 0x6100000a5140 at pc 0x0000055d3363 bp 0x7ffec301eee0 sp 0x7ffec301eed8
15:36:04.074 23860   READ of size 4 at 0x6100000a5140 thread T0 (content_shell)
15:36:04.074 23860       #0 0x55d3362 in SkSL::Compiler::addDefinitions(SkSL::BasicBlock::Node const&, std::__1::unordered_map<SkSL::Variable const*, std::__1::unique_ptr<SkSL::Expression, std::__1::default_delete<SkSL::Expression> >*, std::__1::hash<SkSL::Variable const*>, std::__1::equal_to<SkSL::Variable const*>, std::__1::allocator<std::__1::pair<SkSL::Variable const* const, std::__1::unique_ptr<SkSL::Expression, std::__1::default_delete<SkSL::Expression> >*> > >*) third_party/skia/src/sksl/SkSLCompiler.cpp:211:18
15:36:04.074 23860       #1 0x55dacf9 in SkSL::Compiler::scanCFG(SkSL::FunctionDefinition&) third_party/skia/src/sksl/SkSLCompiler.cpp:883:23
15:36:04.074 23860       #2 0x55cf2a4 in SkSL::Compiler::internalConvertProgram(SkSL::String, SkSL::Modifiers::Flag*, std::__1::vector<std::__1::unique_ptr<SkSL::ProgramElement, std::__1::default_delete<SkSL::ProgramElement> >, std::__1::allocator<std::__1::unique_ptr<SkSL::ProgramElement, std::__1::default_delete<SkSL::ProgramElement> > > >*) third_party/skia/src/sksl/SkSLCompiler.cpp:922:27
15:36:04.074 23860       #3 0x55db583 in SkSL::Compiler::convertProgram(SkSL::Program::Kind, SkSL::String, SkSL::Program::Settings const&) third_party/skia/src/sksl/SkSLCompiler.cpp:980:11
15:36:04.074 23860       #4 0x5553592 in GrGLCompileAndAttachShader(GrGLContext const&, unsigned int, unsigned int, char const**, int*, int, GrGpu::Stats*, SkSL::Program::Settings const&, SkSL::Program::Inputs*) third_party/skia/src/gpu/gl/builders/GrGLShaderStringBuilder.cpp:55:28
15:36:04.074 23860       #5 0x554fa3d in GrGLProgramBuilder::compileAndAttachShaders(GrGLSLShaderBuilder&, unsigned int, unsigned int, SkTDArray<unsigned int>*, SkSL::Program::Settings const&, SkSL::Program::Inputs*) third_party/skia/src/gpu/gl/builders/GrGLProgramBuilder.cpp:79:25
15:36:04.074 23860       #6 0x554e9e0 in GrGLProgramBuilder::finalize() third_party/skia/src/gpu/gl/builders/GrGLProgramBuilder.cpp:144:16
15:36:04.074 23860       #7 0x554d799 in GrGLProgramBuilder::CreateProgram(GrPipeline const&, GrPrimitiveProcessor const&, GrProgramDesc*, GrGLGpu*) third_party/skia/src/gpu/gl/builders/GrGLProgramBuilder.cpp:53:20
15:36:04.074 23860       #8 0x551cb60 in GrGLGpu::ProgramCache::refProgram(GrGLGpu const*, GrPipeline const&, GrPrimitiveProcessor const&, bool) third_party/skia/src/gpu/gl/GrGLGpuProgramCache.cpp:95:32
15:36:04.074 23860       #9 0x54efda1 in GrGLGpu::flushGLState(GrPipeline const&, GrPrimitiveProcessor const&, bool) third_party/skia/src/gpu/gl/GrGLGpu.cpp:1936:47
15:36:04.074 23860       #10 0x54fe906 in GrGLGpu::draw(GrPipeline const&, GrPrimitiveProcessor const&, GrMesh const*, int) third_party/skia/src/gpu/gl/GrGLGpu.cpp:2654:16
15:36:04.074 23860       #11 0x598b81d in GrGpuCommandBuffer::draw(GrPipeline const&, GrPrimitiveProcessor const&, GrMesh const*, int, SkRect const&) third_party/skia/src/gpu/GrGpuCommandBuffer.cpp:47:11
15:36:04.074 23860       #12 0x53fcece in GrMeshDrawOp::onExecute(GrOpFlushState*) third_party/skia/src/gpu/ops/GrMeshDrawOp.cpp:80:33
15:36:04.074 23860       #13 0x536de96 in execute third_party/skia/src/gpu/ops/GrOp.h:145:49
15:36:04.074 23860       #14 0x536de96 in GrRenderTargetOpList::executeOps(GrOpFlushState*) third_party/skia/src/gpu/GrRenderTargetOpList.cpp:172:0
15:36:04.074 23860       #15 0x5325917 in GrDrawingManager::internalFlush(GrSurfaceProxy*, GrResourceCache::FlushType) third_party/skia/src/gpu/GrDrawingManager.cpp:153:26
15:36:04.074 23860       #16 0x5326548 in flush third_party/skia/src/gpu/GrDrawingManager.h:96:15
15:36:04.074 23860       #17 0x5326548 in GrDrawingManager::prepareSurfaceForExternalIO(GrSurfaceProxy*) third_party/skia/src/gpu/GrDrawingManager.cpp:191:0
15:36:04.074 23860       #18 0x5363046 in GrRenderTargetContext::prepareForExternalIO() third_party/skia/src/gpu/GrRenderTargetContext.cpp:1267:29
15:36:04.074 23860       #19 0xdad9179 in blink::Canvas2DLayerBridge::Flush() third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.cpp:808:38
15:36:04.074 23860       #20 0xdadaf61 in blink::Canvas2DLayerBridge::NewImageSnapshot(blink::AccelerationHint, blink::SnapshotReason) third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.cpp:1096:3
15:36:04.074 23860       #21 0x90db157 in blink::Canvas2DImageBufferSurface::NewImageSnapshot(blink::AccelerationHint, blink::SnapshotReason) third_party/WebKit/Source/platform/graphics/Canvas2DImageBufferSurface.h:107:27
15:36:04.074 23860       #22 0x834c501 in blink::ImageBuffer::GetImageData(blink::Multiply, blink::IntRect const&, WTF::ArrayBufferContents&) const third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp:372:39
15:36:04.074 23860       #23 0xacbbe9c in blink::BaseRenderingContext2D::getImageData(int, int, int, int, blink::ExceptionState&) third_party/WebKit/Source/modules/canvas2d/BaseRenderingContext2D.cpp:1670:16
15:36:04.074 23860       #24 0xa4cc466 in getImageDataMethod /b/c/b/linux_layout/src/out/Release/gen/blink/bindings/modules/v8/V8CanvasRenderingContext2D.cpp:1940:29
15:36:04.075 23860       #25 0xa4cc466 in blink::V8CanvasRenderingContext2D::getImageDataMethodCallback(v8::FunctionCallbackInfo<v8::Value> const&) /b/c/b/linux_layout/src/out/Release/gen/blink/bindings/modules/v8/V8CanvasRenderingContext2D.cpp:2867:0
15:36:04.075 23860       #26 0x136c2ad in v8::internal::FunctionCallbackArguments::Call(void (*)(v8::FunctionCallbackInfo<v8::Value> const&)) v8/src/api-arguments.cc:25:3
15:36:04.075 23860       #27 0x1576cc0 in v8::internal::MaybeHandle<v8::internal::Object> v8::internal::(anonymous namespace)::HandleApiCallHelper<false>(v8::internal::Isolate*, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::FunctionTemplateInfo>, v8::internal::Handle<v8::internal::Object>, v8::internal::BuiltinArguments) v8/src/builtins/builtins-api.cc:112:36
15:36:04.075 23860       #28 0x157411c in v8::internal::Builtin_Impl_HandleApiCall(v8::internal::BuiltinArguments, v8::internal::Isolate*) v8/src/builtins/builtins-api.cc:142:5
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