Add support for GL_CHROMIUM_pixel_transfer_buffer_object.

content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_COMMON_GPU_CLIENT_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_
 #define CONTENT_COMMON_GPU_CLIENT_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 585 matching lines @@
   virtual void deleteVertexArrayOES(WebGLId array);
   virtual WGC3Dboolean isVertexArrayOES(WebGLId array);
   virtual void bindVertexArrayOES(WebGLId array);
 
   virtual void bindTexImage2DCHROMIUM(WGC3Denum target, WGC3Dint image_id);
   virtual void releaseTexImage2DCHROMIUM(WGC3Denum target, WGC3Dint image_id);
 
   virtual WebGLId createStreamTextureCHROMIUM(WebGLId texture);
   virtual void destroyStreamTextureCHROMIUM(WebGLId texture);
 
+  virtual void* mapBufferCHROMIUM(WGC3Denum target, WGC3Denum access);
+  virtual WGC3Dboolean unmapBufferCHROMIUM(WGC3Denum target);
+
  protected:
   virtual GrGLInterface* onCreateGrGLInterface();
 
  private:
   // These are the same error codes as used by EGL.
   enum Error {
     SUCCESS               = 0x3000,
     BAD_ATTRIBUTE         = 0x3004,
     CONTEXT_LOST          = 0x300E
   };
@@ skipping 119 matching lines @@
   gpu::gles2::GLES2Implementation* gl_;
   Error last_error_;
   int frame_number_;
   bool bind_generates_resources_;
   bool use_echo_for_swap_ack_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_