ozone: gpu: Add plumbing for platform-specific gpu messaging

content/browser/gpu/gpu_process_host_ui_shim.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_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_
 #define CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_
 
 // This class lives on the UI thread and supports classes like the
 // BackingStoreProxy, which must live on the UI thread. The IO thread
 // portion of this class, the GpuProcessHost, is responsible for
@@ skipping 60 matching lines @@
   // IPC::Listener implementation.
   // The GpuProcessHost causes this to be called on the UI thread to
   // dispatch the incoming messages from the GPU process, which are
   // actually received on the IO thread.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   CONTENT_EXPORT void SimulateRemoveAllContext();
   CONTENT_EXPORT void SimulateCrash();
   CONTENT_EXPORT void SimulateHang();
 
+  // Called to add a listener for a particular message routing ID.

[rjkroege, 2014/06/16 21:38:49]

This comment probably should say why this is here.

+  // Returns true if succeeded.
+  void AddRoute(int32 routing_id, IPC::Listener* listener);
+
  private:
   explicit GpuProcessHostUIShim(int host_id);
   virtual ~GpuProcessHostUIShim();
 
   // Message handlers.
   bool OnControlMessageReceived(const IPC::Message& message);
 
   void OnLogMessage(int level, const std::string& header,
       const std::string& message);
 
   void OnGraphicsInfoCollected(const gpu::GPUInfo& gpu_info);
 
   void OnAcceleratedSurfaceInitialized(int32 surface_id, int32 route_id);
   void OnAcceleratedSurfaceBuffersSwapped(
       const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params);
   void OnAcceleratedSurfacePostSubBuffer(
       const GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params& params);
   void OnAcceleratedSurfaceSuspend(int32 surface_id);
   void OnAcceleratedSurfaceRelease(
       const GpuHostMsg_AcceleratedSurfaceRelease_Params& params);
   void OnVideoMemoryUsageStatsReceived(
       const GPUVideoMemoryUsageStats& video_memory_usage_stats);
   void OnUpdateVSyncParameters(int surface_id,
                                base::TimeTicks timebase,
                                base::TimeDelta interval);
   void OnFrameDrawn(const std::vector<ui::LatencyInfo>& latency_info);
+  void OnPlatformSupportInitialized(int32 host_route_id, int32 gpu_route_id);

[rjkroege, 2014/06/16 21:38:49]

More comments about this message?

 
   // The serial number of the GpuProcessHost / GpuProcessHostUIShim pair.
   int host_id_;
+
+  // Listeners for routed messages.
+  IDMap<IPC::Listener> routes_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_