Run VDA::Decode on GPU IO thread if VDA supports it.

content/common/gpu/media/gpu_video_decode_accelerator.h

Index: content/common/gpu/media/gpu_video_decode_accelerator.h
diff --git a/content/common/gpu/media/gpu_video_decode_accelerator.h b/content/common/gpu/media/gpu_video_decode_accelerator.h
index be093025a9300e6e85eb2a0012be528afdc30485..70d9a440437a932eefd260684fc19efc61f84758 100644
--- a/content/common/gpu/media/gpu_video_decode_accelerator.h
+++ b/content/common/gpu/media/gpu_video_decode_accelerator.h
@@ -11,10 +11,15 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/shared_memory.h"
 #include "content/common/gpu/gpu_command_buffer_stub.h"
+#include "content/common/gpu/media/video_decode_accelerator_impl.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 #include "media/video/video_decode_accelerator.h"
 
+namespace base {
+class MessageLoopProxy;
+}
+
 namespace content {
 
 class GpuVideoDecodeAccelerator
@@ -55,9 +60,12 @@ class GpuVideoDecodeAccelerator
   // The renderer process handle is valid as long as we have a channel between
   // GPU process and the renderer.
   void Initialize(const media::VideoCodecProfile profile,
-                  IPC::Message* init_done_msg);
+                  IPC::Message* init_done_msg,
+                  const scoped_refptr<base::MessageLoopProxy>& io_message_loop);
 
  private:
+  class MessageFilter;
+
   // Handlers for IPC messages.
   void OnDecode(base::SharedMemoryHandle handle, int32 id, uint32 size);
   void OnAssignPictureBuffers(
@@ -70,6 +78,9 @@ class GpuVideoDecodeAccelerator
   void OnReset();
   void OnDestroy();
 
+  // Called on IO thread when |filter_| has been removed.
+  void OnFilterRemoved();
+
   // Message to Send() when initialization is done.  Is only non-NULL during
   // initialization and is owned by the IPC channel underlying the
   // GpuCommandBufferStub.
@@ -82,7 +93,7 @@ class GpuVideoDecodeAccelerator
   GpuCommandBufferStub* stub_;
 
   // The underlying VideoDecodeAccelerator.
-  scoped_ptr<media::VideoDecodeAccelerator> video_decode_accelerator_;
+  scoped_ptr<VideoDecodeAcceleratorImpl> video_decode_accelerator_;
 
   // Callback for making the relevant context current for GL calls.
   // Returns false if failed.
@@ -91,6 +102,12 @@ class GpuVideoDecodeAccelerator
   // The texture target as requested by ProvidePictureBuffers().
   uint32 texture_target_;
 
+  // The message filter to run VDA::Decode on IO thread if VDA supports it.
+  scoped_refptr<MessageFilter> filter_;
+
+  // GPU child message loop.
+  scoped_refptr<base::MessageLoopProxy> child_message_loop_;
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(GpuVideoDecodeAccelerator);
 };