Updates on canvas backreference for canvas rendering contexts

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.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 54 matching lines @@
 namespace blink {
 
 class ANGLEInstancedArrays;
 class EXTBlendMinMax;
 class EXTDisjointTimerQuery;
 class EXTFragDepth;
 class EXTShaderTextureLOD;
 class EXTsRGB;
 class EXTTextureFilterAnisotropic;
 class ExceptionState;
+class HTMLCanvasElementOrOffscreenCanvas;
 class HTMLImageElement;
 class HTMLVideoElement;
 class ImageBitmap;
 class ImageBuffer;
 class ImageData;
 class IntSize;
 class OESElementIndexUint;
 class OESStandardDerivatives;
 class OESTextureFloat;
 class OESTextureFloatLinear;
@@ skipping 321 matching lines @@
         Member<WebGLTexture> m_textureCubeMapBinding;
         Member<WebGLTexture> m_texture3DBinding;
         Member<WebGLTexture> m_texture2DArrayBinding;
 
         DECLARE_TRACE();
     };
 
     void setFilterQuality(SkFilterQuality) override;
     bool isWebGL2OrHigher() { return version() >= 2; }
 
+    void getHTMLOrOffscreenCanvas(HTMLCanvasElementOrOffscreenCanvas&) const;
+
 protected:
     friend class EXTDisjointTimerQuery;
     friend class WebGLDrawBuffers;
     friend class WebGLFramebuffer;
     friend class WebGLObject;
     friend class WebGLContextObject;
     friend class OESVertexArrayObject;
     friend class WebGLDebugShaders;
     friend class WebGLCompressedTextureASTC;
     friend class WebGLCompressedTextureATC;
@@ skipping 690 matching lines @@
     const unsigned m_version;
 };
 
 DEFINE_TYPE_CASTS(WebGLRenderingContextBase, CanvasRenderingContext, context, context->is3d(), context.is3d());
 
 } // namespace blink
 
 WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(blink::WebGLRenderingContextBase::TextureUnitState);
 
 #endif // WebGLRenderingContextBase_h