Provide callback to create mojo AndroidOverlays to AVDA.

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 8cc3f2ff4b7a236ebc298622ec0366ff43898620..48f798b26e2e74919581df77790f3a42296e8b4a 100644
--- a/media/gpu/ipc/service/media_gpu_channel_manager.h
+++ b/media/gpu/ipc/service/media_gpu_channel_manager.h
@@ -15,6 +15,7 @@
 #include "base/unguessable_token.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
+#include "media/base/android_overlay_mojo_factory.h"
 #include "media/video/video_decode_accelerator.h"
 
 namespace gpu {
@@ -36,6 +37,8 @@ class MediaGpuChannelManager
   void RemoveChannel(int32_t client_id);
   void DestroyAllChannels();
 
+  void SetOverlayFactory(AndroidOverlayMojoFactoryCB overlay_factory_cb);
+
   // TODO(sandersd): Should we expose the MediaGpuChannel instead?
   gpu::GpuChannel* LookupChannel(const base::UnguessableToken& channel_token);
 
@@ -45,6 +48,7 @@ class MediaGpuChannelManager
       media_gpu_channels_;
   std::map<base::UnguessableToken, int32_t> token_to_channel_;
   std::map<int32_t, base::UnguessableToken> channel_to_token_;
+  AndroidOverlayMojoFactoryCB overlay_factory_cb_;
   DISALLOW_COPY_AND_ASSIGN(MediaGpuChannelManager);
 };