gpu: Add GpuFence framework.

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 520 matching lines @@
   GLuint CreateImageCHROMIUMHelper(ClientBuffer buffer,
                                    GLsizei width,
                                    GLsizei height,
                                    GLenum internalformat);
   void DestroyImageCHROMIUMHelper(GLuint image_id);
   GLuint CreateGpuMemoryBufferImageCHROMIUMHelper(GLsizei width,
                                                   GLsizei height,
                                                   GLenum internalformat,
                                                   GLenum usage);
 
+  GLuint CreateFenceCHROMIUMHelper(ClientFence fence);
+  void DestroyFenceCHROMIUMHelper(GLuint fence_id);
+
   // Helper for GetVertexAttrib
   bool GetVertexAttribHelper(GLuint index, GLenum pname, uint32_t* param);
 
   GLuint GetMaxValueInBufferCHROMIUMHelper(
       GLuint buffer_id, GLsizei count, GLenum type, GLuint offset);
 
   void WaitAllAsyncTexImage2DCHROMIUMHelper();
 
   void RestoreElementAndArrayBuffers(bool restore);
   void RestoreArrayBuffer(bool restrore);
@@ skipping 323 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_