Add mailbox-based Mojo VideoFrame variant.

media/mojo/services/mojo_video_decoder_service.cc

Index: media/mojo/services/mojo_video_decoder_service.cc
diff --git a/media/mojo/services/mojo_video_decoder_service.cc b/media/mojo/services/mojo_video_decoder_service.cc
index 84b0308804deae8fd28ed50b4eaaf8a4772c2efb..e9f5531d0b28112544f8d4b18560a73a943144f6 100644
--- a/media/mojo/services/mojo_video_decoder_service.cc
+++ b/media/mojo/services/mojo_video_decoder_service.cc
@@ -133,7 +133,15 @@ void MojoVideoDecoderService::OnDecoderOutput(
     const scoped_refptr<VideoFrame>& frame) {
   DVLOG(2) << __func__;
   DCHECK(client_);
-  client_->OnVideoFrameDecoded(mojom::VideoFrame::From(frame));
+  client_->OnVideoFrameDecoded(
+      mojom::VideoFrame::From(frame),
+      base::Bind(&MojoVideoDecoderService::OnVideoFrameDestroyed,
+                 base::Unretained(this)));
+}
+
+void MojoVideoDecoderService::OnVideoFrameDestroyed(
+    const base::Optional<gpu::SyncToken>& release_sync_token) {
+  DVLOG(2) << __func__;
 }
 
 }  // namespace media