Make OffscreenCanvas an EventTarget

third_party/WebKit/Source/modules/webgl/WebGLRenderingContext.h

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 73 matching lines @@
   DECLARE_VIRTUAL_TRACE();
 
   DECLARE_VIRTUAL_TRACE_WRAPPERS();
 
  private:
   WebGLRenderingContext(HTMLCanvasElement*,
                         std::unique_ptr<WebGraphicsContext3DProvider>,
                         const CanvasContextCreationAttributes&);
   WebGLRenderingContext(OffscreenCanvas*,
                         std::unique_ptr<WebGraphicsContext3DProvider>,
-                        const CanvasContextCreationAttributes&);
+                        const CanvasContextCreationAttributes&,
+                        ExecutionContext*);
 
   // Enabled extension objects.
   Member<ANGLEInstancedArrays> m_angleInstancedArrays;
   Member<EXTBlendMinMax> m_extBlendMinMax;
   Member<EXTDisjointTimerQuery> m_extDisjointTimerQuery;
   Member<EXTFragDepth> m_extFragDepth;
   Member<EXTShaderTextureLOD> m_extShaderTextureLOD;
   Member<EXTsRGB> m_extsRGB;
   Member<EXTTextureFilterAnisotropic> m_extTextureFilterAnisotropic;
   Member<OESTextureFloat> m_oesTextureFloat;
@@ skipping 22 matching lines @@
                   context,
                   context->is3d() &&
                       WebGLRenderingContextBase::getWebGLVersion(context) == 1,
                   context.is3d() &&
                       WebGLRenderingContextBase::getWebGLVersion(&context) ==
                           1);
 
 }  // namespace blink
 
 #endif  // WebGLRenderingContext_h