Route IPC through browser when creating a viewable command buffer.

chrome/browser/gpu_process_host.h

 // Copyright (c) 2010 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 CHROME_BROWSER_GPU_PROCESS_HOST_H_
 #define CHROME_BROWSER_GPU_PROCESS_HOST_H_
 #pragma once
 
 #include <queue>
 
 #include "base/basictypes.h"
 #include "base/ref_counted.h"
 #include "base/threading/non_thread_safe.h"
 #include "chrome/browser/browser_child_process_host.h"
 #include "gfx/native_widget_types.h"
 
 class GpuBlacklist;
+struct GPUCreateCommandBufferConfig;
 class GPUInfo;
 class RenderMessageFilter;
 
 namespace IPC {
 struct ChannelHandle;
 class Message;
 }
 
 class GpuProcessHost : public BrowserChildProcessHost,
                        public base::NonThreadSafe {
  public:
   // Getter for the singleton. This will return NULL on failure.
   static GpuProcessHost* Get();
 
   virtual bool Send(IPC::Message* msg);
 
   // IPC::Channel::Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& message);
 
   // Tells the GPU process to create a new channel for communication with a
   // renderer. Will asynchronously send message to object with given routing id
   // on completion.
   void EstablishGpuChannel(int renderer_id, RenderMessageFilter* filter);
 
   // Sends a reply message later when the next GpuHostMsg_SynchronizeReply comes
   // in.
   void Synchronize(IPC::Message* reply, RenderMessageFilter* filter);
 
+  // Tells the GPU process to create a new command buffer that draws into the
+  // window associated with the given renderer.
+  void CreateViewCommandBuffer(
+      int32 render_view_id,
+      int32 renderer_id,
+      const GPUCreateCommandBufferConfig& init_params,
+      IPC::Message* reply,
+      RenderMessageFilter* filter);
+
+  // We need to hop threads when creating the command buffer.
+  // Let these tasks access our internals.
+  friend class CVCBThreadHopping;
+
  private:
   // Used to queue pending channel requests.
   struct ChannelRequest {
     explicit ChannelRequest(RenderMessageFilter* filter);
     ~ChannelRequest();
 
     // Used to send the reply message back to the renderer.
     scoped_refptr<RenderMessageFilter> filter;
   };
 
-  // Used to queue pending synchronization requests.
-  struct SynchronizationRequest {
-    SynchronizationRequest(IPC::Message* reply, RenderMessageFilter* filter);
-    ~SynchronizationRequest();
+  struct DelayedReply {
+    DelayedReply(IPC::Message* reply, RenderMessageFilter* filter);
+    ~DelayedReply();
 
     // The delayed reply message which needs to be sent to the
     // renderer.
     IPC::Message* reply;
 
     // Used to send the reply message back to the renderer.
     scoped_refptr<RenderMessageFilter> filter;
   };
 
   GpuProcessHost();
   virtual ~GpuProcessHost();
 
   bool EnsureInitialized();
   bool Init();
 
   bool OnControlMessageReceived(const IPC::Message& message);
 
   // Message handlers.
   void OnChannelEstablished(const IPC::ChannelHandle& channel_handle,
                             const GPUInfo& gpu_info);
   void OnSynchronizeReply();
+  void OnCommandBufferCreated(const int32 route_id);
 
   // Sends the response for establish channel request to the renderer.
   void SendEstablishChannelReply(const IPC::ChannelHandle& channel,
                                  const GPUInfo& gpu_info,
                                  RenderMessageFilter* filter);
-  // Sends the response for synchronization request to the renderer.
-  void SendSynchronizationReply(IPC::Message* reply,
-                                RenderMessageFilter* filter);
 
   // Sends outstanding replies to renderer processes. This is only called
   // in error situations like the GPU process crashing -- but is necessary
   // to prevent the renderer process from hanging.
   void SendOutstandingReplies();
 
   virtual bool CanShutdown();
   virtual void OnChildDied();
   virtual void OnProcessCrashed(int exit_code);
 
   bool CanLaunchGpuProcess() const;
   bool LaunchGpuProcess();
 
   bool LoadGpuBlacklist();
 
   bool initialized_;
   bool initialized_successfully_;
 
   bool blacklist_result_recorded_;
 
   scoped_ptr<GpuBlacklist> gpu_blacklist_;
 
   // These are the channel requests that we have already sent to
   // the GPU process, but haven't heard back about yet.
   std::queue<ChannelRequest> sent_requests_;
 
   // The pending synchronization requests we need to reply to.
-  std::queue<SynchronizationRequest> queued_synchronization_replies_;
+  std::queue<DelayedReply> queued_synchronization_replies_;
+
+  // The pending create command buffer requests we need to reply to.
+  std::queue<DelayedReply> create_command_buffer_replies_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuProcessHost);
 };
 
+
 #endif  // CHROME_BROWSER_GPU_PROCESS_HOST_H_