gpu: Add CHROMIUM_gpu_memory_buffer_image extension.

gpu/command_buffer/client/gles2_implementation.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 GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_
 #define GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_
 
 #include <GLES2/gl2.h>
 
 #include <list>
@@ skipping 537 matching lines @@
 
   GLuint CreateImageCHROMIUMHelper(GLsizei width,
                                    GLsizei height,
                                    GLenum internalformat,
                                    GLenum usage);
   void DestroyImageCHROMIUMHelper(GLuint image_id);
   void* MapImageCHROMIUMHelper(GLuint image_id);
   void UnmapImageCHROMIUMHelper(GLuint image_id);
   void GetImageParameterivCHROMIUMHelper(
       GLuint image_id, GLenum pname, GLint* params);
+  GLuint CreateGpuMemoryBufferImageCHROMIUMHelper(GLsizei width,
+                                                  GLsizei height,
+                                                  GLenum internalformat,
+                                                  GLenum usage);
 
   // Helper for GetVertexAttrib
   bool GetVertexAttribHelper(GLuint index, GLenum pname, uint32* param);
 
   GLuint GetMaxValueInBufferCHROMIUMHelper(
       GLuint buffer_id, GLsizei count, GLenum type, GLuint offset);
 
   void RestoreElementAndArrayBuffers(bool restore);
   void RestoreArrayBuffer(bool restrore);
 
@@ skipping 254 matching lines @@
 
 inline bool GLES2Implementation::GetTexParameterivHelper(
     GLenum /* target */, GLenum /* pname */, GLint* /* params */) {
   return false;
 }
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_