media: Add GpuMojoMediaClient.

media/gpu/ipc/service/media_gpu_channel_manager.h

Index: media/gpu/ipc/service/media_gpu_channel_manager.h
diff --git a/media/gpu/ipc/service/media_gpu_channel_manager.h b/media/gpu/ipc/service/media_gpu_channel_manager.h
index 718b8b8f33395fa48d06428a948901d244ce0548..46b9432c281e05c79e74e9a9335a6cf7274d12c9 100644
--- a/media/gpu/ipc/service/media_gpu_channel_manager.h
+++ b/media/gpu/ipc/service/media_gpu_channel_manager.h
@@ -11,6 +11,7 @@
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 #include "media/video/video_decode_accelerator.h"
@@ -24,7 +25,8 @@ namespace media {
 
 class MediaGpuChannel;
 
-class MediaGpuChannelManager {
+class MediaGpuChannelManager
+    : public base::SupportsWeakPtr<MediaGpuChannelManager> {
  public:
   explicit MediaGpuChannelManager(gpu::GpuChannelManager* channel_manager);
   ~MediaGpuChannelManager();