Add mailbox-based Mojo VideoFrame variant.

media/mojo/services/mojo_video_decoder_service.h

Index: media/mojo/services/mojo_video_decoder_service.h
diff --git a/media/mojo/services/mojo_video_decoder_service.h b/media/mojo/services/mojo_video_decoder_service.h
index ce824eee56c76b9293fb7244705deb671068eb4f..c0e0b45e6d45fb08e0e3c505696ef8270fcaa662 100644
--- a/media/mojo/services/mojo_video_decoder_service.h
+++ b/media/mojo/services/mojo_video_decoder_service.h
@@ -9,9 +9,14 @@
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "base/optional.h"
 #include "media/base/decode_status.h"
 #include "media/mojo/interfaces/video_decoder.mojom.h"
 
+namespace gpu {
+struct SyncToken;
+};
+
 namespace media {
 
 class MojoDecoderBufferReader;
@@ -49,6 +54,8 @@ class MojoVideoDecoderService : public mojom::VideoDecoder {
   void OnDecoderReset(const ResetCallback& callback);
 
   void OnDecoderOutput(const scoped_refptr<VideoFrame>& frame);
+  void OnVideoFrameDestroyed(

[xhwang, 2017/01/25 18:25:09]

nit: In VideoFrame we have DestructionObserver, how about s/Destroy/Destruct/?

[sandersd (OOO until July 31), 2017/01/26 23:49:05]

Renamed to OnReleaseMailbox().

+      const base::Optional<gpu::SyncToken>& release_sync_token);
 
   mojom::VideoDecoderClientAssociatedPtr client_;
   std::unique_ptr<MojoDecoderBufferReader> mojo_decoder_buffer_reader_;