webgl: optimize webgl.texSubImage2D(video) path.

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 816 matching lines @@
     void texSubImage2DImpl(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLenum format, GLenum type, Image*, WebGLImageConversion::ImageHtmlDomSource, bool flipY, bool premultiplyAlpha);
 
     enum TexImageFunctionType {
         NotTexSubImage2D,
         TexSubImage2D,
     };
     // Copy from the canvas element directly to the texture via the GPU, without a read-back to system memory.
     void texImage2DCanvasByGPU(TexImageFunctionType, WebGLTexture*, GLenum target, GLint level,
         GLenum internalformat, GLenum type, GLint xoffset, GLint yoffset, HTMLCanvasElement*);
 
+    bool texImage2DVideoByGPU(TexImageFunctionType, WebGLTexture*, GLenum target, GLint level,
+        GLenum internalformat, GLenum type, GLint xoffset, GLint yoffset, HTMLVideoElement*);
+
     void handleTextureCompleteness(const char*, bool);
     void createFallbackBlackTextures1x1();
 
     // Helper function for copyTex{Sub}Image, check whether the internalformat
     // and the color buffer format of the current bound framebuffer combination
     // is valid.
     bool isTexInternalFormatColorBufferCombinationValid(GLenum texInternalFormat, GLenum colorBufferFormat);
 
     // Helper function to get the bound framebuffer's color buffer format.
     virtual GLenum boundFramebufferColorFormat();
@@ skipping 280 matching lines @@
     static IntSize oldestContextSize();
 };
 
 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