Sample code: IPC Transport object for GPU

content/common/gpu/client/gpu_video_decode_accelerator_host.h

Index: content/common/gpu/client/gpu_video_decode_accelerator_host.h
diff --git a/content/common/gpu/client/gpu_video_decode_accelerator_host.h b/content/common/gpu/client/gpu_video_decode_accelerator_host.h
index 5e4ba9df1f6cced6d26096f163b0bda63bd10368..e55b4dcd1186cefce81ea9924acaaa3a959b489f 100644
--- a/content/common/gpu/client/gpu_video_decode_accelerator_host.h
+++ b/content/common/gpu/client/gpu_video_decode_accelerator_host.h
@@ -13,7 +13,7 @@
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "content/common/gpu/client/command_buffer_proxy_impl.h"
-#include "ipc/ipc_listener.h"
+#include "content/common/gpu/client/ipc/gpu_video_decode_accelerator_host_ipc_transport.h"
 #include "media/video/video_decode_accelerator.h"
 #include "ui/gfx/geometry/size.h"
 
@@ -23,22 +23,21 @@ class GpuChannelHost;
 // This class is used to talk to VideoDecodeAccelerator in the Gpu process
 // through IPC messages.
 class GpuVideoDecodeAcceleratorHost
-    : public IPC::Listener,
-      public media::VideoDecodeAccelerator,
+    : public media::VideoDecodeAccelerator,
       public CommandBufferProxyImpl::DeletionObserver,
+      public GpuVideoDecodeAcceleratorHostIPCTransport::Client,
       public base::NonThreadSafe {
  public:
   // |this| is guaranteed not to outlive |channel| and |impl|.  (See comments
   // for |channel_| and |impl_|.)
-  GpuVideoDecodeAcceleratorHost(GpuChannelHost* channel,
-                                CommandBufferProxyImpl* impl);
-
-  // IPC::Listener implementation.
-  void OnChannelError() override;
-  bool OnMessageReceived(const IPC::Message& message) override;
+  GpuVideoDecodeAcceleratorHost(
+      GpuChannelHost* channel,
+      scoped_ptr<GpuVideoDecodeAcceleratorHostIPCTransport> transport,
+      CommandBufferProxyImpl* impl);
 
   // media::VideoDecodeAccelerator implementation.
-  bool Initialize(const Config& config, Client* client) override;
+  bool Initialize(const Config& config,
+                  media::VideoDecodeAccelerator::Client* client) override;
   void SetCdm(int cdm_id) override;
   void Decode(const media::BitstreamBuffer& bitstream_buffer) override;
   void AssignPictureBuffers(
@@ -56,36 +55,33 @@ class GpuVideoDecodeAcceleratorHost
   ~GpuVideoDecodeAcceleratorHost() override;
 
   // Notify |client_| of an error.  Posts a task to avoid re-entrancy.
-  void PostNotifyError(Error);
-
-  void Send(IPC::Message* message);
+  void PostNotifyError(media::VideoDecodeAccelerator::Error error);
 
   // IPC handlers, proxying media::VideoDecodeAccelerator::Client for the GPU
   // process.  Should not be called directly.
-  void OnCdmAttached(bool success);
-  void OnBitstreamBufferProcessed(int32_t bitstream_buffer_id);
+  void OnCdmAttached(bool success) override;
+  void OnBitstreamBufferProcessed(int32_t bitstream_buffer_id) override;
   void OnProvidePictureBuffer(uint32_t num_requested_buffers,
                               const gfx::Size& dimensions,
-                              uint32_t texture_target);
-  void OnDismissPictureBuffer(int32_t picture_buffer_id);
+                              uint32_t texture_target) override;
+  void OnDismissPictureBuffer(int32_t picture_buffer_id) override;
   void OnPictureReady(int32_t picture_buffer_id,
                       int32_t bitstream_buffer_id,
                       const gfx::Rect& visible_rect,
-                      bool allow_overlay);
-  void OnFlushDone();
-  void OnResetDone();
-  void OnNotifyError(uint32_t error);
+                      bool allow_overlay) override;
+  void OnFlushDone() override;
+  void OnResetDone() override;
+  void OnNotifyError(uint32_t error) override;
 
   // Unowned reference to the GpuChannelHost to send IPC messages to the GPU
   // process.  |channel_| outlives |impl_|, so the reference is always valid as
   // long as it is not NULL.
   GpuChannelHost* channel_;
 
-  // Route ID for the associated decoder in the GPU process.
-  int32_t decoder_route_id_;
+  scoped_ptr<GpuVideoDecodeAcceleratorHostIPCTransport> transport_;
 
   // The client that will receive callbacks from the decoder.
-  Client* client_;
+  media::VideoDecodeAccelerator::Client* client_;
 
   // Unowned reference to the CommandBufferProxyImpl that created us.  |this|
   // registers as a DeletionObserver of |impl_|, the so reference is always