MojoVideoDecoder: Plumb metadata methods.

media/mojo/clients/mojo_video_decoder.h

Index: media/mojo/clients/mojo_video_decoder.h
diff --git a/media/mojo/clients/mojo_video_decoder.h b/media/mojo/clients/mojo_video_decoder.h
index 1c0facc01bdb1fae37ec737a704c897ba7d0e321..78d36c324d81a619718d5ee3f7f9ddff83be968b 100644
--- a/media/mojo/clients/mojo_video_decoder.h
+++ b/media/mojo/clients/mojo_video_decoder.h
@@ -50,12 +50,16 @@ class MojoVideoDecoder final : public VideoDecoder,
   void OnVideoFrameDecoded(mojom::VideoFramePtr frame) final;
 
  private:
-  void OnInitializeDone(bool status);
-  void OnDecodeDone(DecodeStatus status);
+  void OnInitializeDone(bool status,
+                        bool needs_bitstream_conversion,
+                        int32_t max_decode_requests);
+  void OnDecodeDone(uint64_t decode_id, DecodeStatus status);
   void OnResetDone();
 
   void BindRemoteDecoder();
-  void OnConnectionError();
+
+  // Cleans up callbacks and blocks future calls.
+  void Stop();
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   GpuVideoAcceleratorFactories* gpu_factories_;
@@ -66,7 +70,8 @@ class MojoVideoDecoder final : public VideoDecoder,
 
   InitCB init_cb_;
   OutputCB output_cb_;
-  DecodeCB decode_cb_;
+  uint64_t decode_counter_ = 0;
+  std::map<uint64_t, DecodeCB> pending_decodes_;
   base::Closure reset_cb_;
 
   mojom::VideoDecoderPtr remote_decoder_;
@@ -75,6 +80,10 @@ class MojoVideoDecoder final : public VideoDecoder,
   bool has_connection_error_ = false;
   mojo::AssociatedBinding<VideoDecoderClient> client_binding_;
 
+  bool initialized_ = false;
+  bool needs_bitstream_conversion_ = false;
+  int32_t max_decode_requests_ = 1;
+
   DISALLOW_COPY_AND_ASSIGN(MojoVideoDecoder);
 };