GPU: Adding sync points for cross-channel synchronization

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_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 124 matching lines @@
   // graphics context fails to create. Do not call from more than one thread.
   virtual bool makeContextCurrent();
 
   virtual int width();
   virtual int height();
 
   virtual bool isGLES2Compliant();
 
   virtual bool setParentContext(WebGraphicsContext3D* parent_context);
 
+  virtual unsigned int insertSyncPoint();
+  virtual void waitSyncPoint(unsigned int);
+
   virtual void reshape(int width, int height);
 
   virtual bool readBackFramebuffer(unsigned char* pixels, size_t buffer_size);
   virtual bool readBackFramebuffer(unsigned char* pixels, size_t buffer_size,
                                    WebGLId framebuffer, int width, int height);
 
   virtual WebGLId getPlatformTextureId();
   virtual void prepareTexture();
   virtual void postSubBufferCHROMIUM(int x, int y, int width, int height);
 
@@ skipping 531 matching lines @@
   CommandBufferProxy* command_buffer_;
   gpu::gles2::GLES2CmdHelper* gles2_helper_;
   gpu::TransferBuffer* transfer_buffer_;
   gpu::gles2::GLES2Implementation* gl_;
   Error last_error_;
   int frame_number_;
   bool bind_generates_resources_;
 };
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_