Sample code: IPC Transport object for GPU

content/common/gpu/client/gpu_video_encode_accelerator_host.h

Index: content/common/gpu/client/gpu_video_encode_accelerator_host.h
diff --git a/content/common/gpu/client/gpu_video_encode_accelerator_host.h b/content/common/gpu/client/gpu_video_encode_accelerator_host.h
index 38995938259325cd243d02ce5f34d30cd963c995..f70c7c3af31282e838b8fefa62b669c2a7e8e345 100644
--- a/content/common/gpu/client/gpu_video_encode_accelerator_host.h
+++ b/content/common/gpu/client/gpu_video_encode_accelerator_host.h
@@ -15,8 +15,8 @@
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "content/common/gpu/client/command_buffer_proxy_impl.h"
+#include "content/common/gpu/client/ipc/gpu_video_encode_accelerator_host_ipc_transport.h"
 #include "gpu/config/gpu_info.h"
-#include "ipc/ipc_listener.h"
 #include "media/video/video_encode_accelerator.h"
 
 namespace gfx {
@@ -38,19 +38,17 @@ class GpuChannelHost;
 // This class is the renderer-side host for the VideoEncodeAccelerator in the
 // GPU process, coordinated over IPC.
 class GpuVideoEncodeAcceleratorHost
-    : public IPC::Listener,
-      public media::VideoEncodeAccelerator,
+    : public media::VideoEncodeAccelerator,
       public CommandBufferProxyImpl::DeletionObserver,
+      public GpuVideoEncodeAcceleratorHostIPCTransport::Client,
       public base::NonThreadSafe {
  public:
   // |this| is guaranteed not to outlive |channel| and |impl|.  (See comments
   // for |channel_| and |impl_|.)
-  GpuVideoEncodeAcceleratorHost(GpuChannelHost* channel,
-                                CommandBufferProxyImpl* impl);
-
-  // IPC::Listener implementation.
-  bool OnMessageReceived(const IPC::Message& message) override;
-  void OnChannelError() override;
+  GpuVideoEncodeAcceleratorHost(
+      GpuChannelHost* channel,
+      scoped_ptr<GpuVideoEncodeAcceleratorHostIPCTransport> transport,
+      CommandBufferProxyImpl* impl);
 
   // media::VideoEncodeAccelerator implementation.
   SupportedProfiles GetSupportedProfiles() override;
@@ -58,7 +56,7 @@ class GpuVideoEncodeAcceleratorHost
                   const gfx::Size& input_visible_size,
                   media::VideoCodecProfile output_profile,
                   uint32_t initial_bitrate,
-                  Client* client) override;
+                  media::VideoEncodeAccelerator::Client* client) override;
   void Encode(const scoped_refptr<media::VideoFrame>& frame,
               bool force_keyframe) override;
   void UseOutputBitstreamBuffer(const media::BitstreamBuffer& buffer) override;
@@ -83,29 +81,26 @@ class GpuVideoEncodeAcceleratorHost
   void PostNotifyError(const tracked_objects::Location& location,
                        Error error, const std::string& message);
 
-  void Send(IPC::Message* message);
-
   // IPC handlers, proxying media::VideoEncodeAccelerator::Client for the GPU
   // process.  Should not be called directly.
   void OnRequireBitstreamBuffers(uint32_t input_count,
                                  const gfx::Size& input_coded_size,
-                                 uint32_t output_buffer_size);
-  void OnNotifyInputDone(int32_t frame_id);
+                                 uint32_t output_buffer_size) override;
+  void OnNotifyInputDone(int32_t frame_id) override;
   void OnBitstreamBufferReady(int32_t bitstream_buffer_id,
                               uint32_t payload_size,
-                              bool key_frame);
-  void OnNotifyError(Error error);
+                              bool key_frame) override;
+  void OnNotifyError(Error 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 encoder in the GPU process.
-  int32_t encoder_route_id_;
+  scoped_ptr<GpuVideoEncodeAcceleratorHostIPCTransport> transport_;
 
   // The client that will receive callbacks from the encoder.
-  Client* client_;
+  media::VideoEncodeAccelerator::Client* client_;
 
   // Unowned reference to the CommandBufferProxyImpl that created us.  |this|
   // registers as a DeletionObserver of |impl_|, so the reference is always