Added GPU process "echo" IPC message.

content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h

 // Copyright (c) 2011 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_RENDERER_GPU_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_
 #define CONTENT_RENDERER_GPU_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_
 #pragma once
 
 #if defined(ENABLE_GPU)
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
+#include "base/task.h"
 #include "content/renderer/gpu/renderer_gl_context.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebGraphicsContext3D.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebString.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
 #include "ui/gfx/native_widget_types.h"
 
 #if !defined(OS_MACOSX)
 #define FLIP_FRAMEBUFFER_VERTICALLY
 #endif
 
@@ skipping 437 matching lines @@
 
   WebKit::WebGraphicsContext3D::Attributes attributes_;
   int cached_width_, cached_height_;
 
   // For tracking which FBO is bound.
   WebGLId bound_fbo_;
 
   // Errors raised by synthesizeGLError().
   std::vector<WGC3Denum> synthetic_errors_;
 
+  ScopedRunnableMethodFactory<WebGraphicsContext3DCommandBufferImpl>
+      method_factory_;
+
 #ifdef FLIP_FRAMEBUFFER_VERTICALLY
   scoped_array<uint8> scanline_;
   void FlipVertically(uint8* framebuffer,
                       unsigned int width,
                       unsigned int height);
 #endif
 };
 
 #endif  // defined(ENABLE_GPU)
 #endif  // CONTENT_RENDERER_GPU_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_