Added GPU process "echo" IPC message.

content/renderer/gpu/renderer_gl_context.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.
 
 // This API is consistent with other OpenGL setup APIs like window's WGL
 // and pepper's PGL. This API is used to manage OpenGL RendererGLContexts in the
 // Chrome renderer process in a way that is consistent with other platforms.
 
 #ifndef CONTENT_RENDERER_GPU_RENDERER_GL_CONTEXT_H_
 #define CONTENT_RENDERER_GPU_RENDERER_GL_CONTEXT_H_
 #pragma once
 
 #include "base/callback_old.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "build/build_config.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/size.h"
 
 class GpuChannelHost;
 class MessageLoop;
 class CommandBufferProxy;
 class GURL;
+class Task;
 class TransportTextureHost;
 
 namespace gpu {
 namespace gles2 {
 class GLES2CmdHelper;
 class GLES2Implementation;
 }
 }
 
 class RendererGLContext : public base::SupportsWeakPtr<RendererGLContext> {
@@ skipping 98 matching lines @@
   // does not have a parent.
   uint32 GetParentTextureId();
 
   // Create a new texture in the parent's RendererGLContext.  Returns zero if
   // RendererGLContext does not have a parent.
   uint32 CreateParentTexture(const gfx::Size& size);
 
   // Deletes a texture in the parent's RendererGLContext.
   void DeleteParentTexture(uint32 texture);
 
-  // Provides a callback that will be invoked when SwapBuffers has completed
-  // service side.
-  void SetSwapBuffersCallback(Callback0::Type* callback);
-
   void SetContextLostCallback(Callback1<ContextLostReason>::Type* callback);
 
   // Set the current RendererGLContext for the calling thread.
   static bool MakeCurrent(RendererGLContext* context);
 
   // For a view RendererGLContext, display everything that has been rendered
   // since the last call. For an offscreen RendererGLContext, resolve everything
   // that has been rendered since the last call to a copy that can be accessed
   // by the parent RendererGLContext.
   bool SwapBuffers();
 
+  // Run the task once the channel has been flushed. Takes care of deleting the
+  // task whether the echo succeeds or not.
+  bool Echo(Task* task);
+
   // Create a TransportTextureHost object associated with the context.
   scoped_refptr<TransportTextureHost> CreateTransportTextureHost();
 
   // TODO(gman): Remove this
   void DisableShaderTranslation();
 
   // Allows direct access to the GLES2 implementation so a RendererGLContext
   // can be used without making it current.
   gpu::gles2::GLES2Implementation* GetImplementation();
 
@@ skipping 11 matching lines @@
 
   bool Initialize(bool onscreen,
                   int render_view_id,
                   const gfx::Size& size,
                   RendererGLContext* share_group,
                   const char* allowed_extensions,
                   const int32* attrib_list,
                   const GURL& active_url);
   void Destroy();
 
-  void OnSwapBuffers();
   void OnContextLost();
 
   scoped_refptr<GpuChannelHost> channel_;
   base::WeakPtr<RendererGLContext> parent_;
-  scoped_ptr<Callback0::Type> swap_buffers_callback_;
   scoped_ptr<Callback1<ContextLostReason>::Type> context_lost_callback_;
   uint32 parent_texture_id_;
   CommandBufferProxy* command_buffer_;
   gpu::gles2::GLES2CmdHelper* gles2_helper_;
   int32 transfer_buffer_id_;
   gpu::gles2::GLES2Implementation* gles2_implementation_;
   Error last_error_;
   int frame_number_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererGLContext);
 };
 
 #endif  // CONTENT_RENDERER_GPU_RENDERER_GL_CONTEXT_H_