Support uploads of sub-rectangles of canvases to 2D and 3D textures.

third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.h

 /*
  * Copyright (c) 2010, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 183 matching lines @@
   // DrawingBuffer.
   PassRefPtr<StaticBitmapImage> transferToStaticBitmapImage();
 
   bool copyToPlatformTexture(gpu::gles2::GLES2Interface*,
                              GLuint texture,
                              GLenum internalFormat,
                              GLenum destType,
                              GLint level,
                              bool premultiplyAlpha,
                              bool flipY,
+                             const IntPoint& destTextureOffset,
+                             const IntRect& sourceSubRectangle,
                              SourceDrawingBuffer);
 
   bool paintRenderingResultsToImageData(int&,
                                         int&,
                                         SourceDrawingBuffer,
                                         WTF::ArrayBufferContents&);
 
   int sampleCount() const { return m_sampleCount; }
   bool explicitResolveOfMultisampleData() const {
     return m_antiAliasingMode == MSAAExplicitResolve;
@@ skipping 298 matching lines @@
   // RuntimeEnabledFeatures::webGLImageChromiumEnabled() call with
   // shouldUseChromiumImage() calls, and set m_chromiumImageUsage to
   // DisallowChromiumImage in the case of OffscreenCanvas.
   ChromiumImageUsage m_chromiumImageUsage;
   bool shouldUseChromiumImage();
 };
 
 }  // namespace blink
 
 #endif  // DrawingBuffer_h