Example MojoVideoDecoder decoder using the command buffer.

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 d975229ab03a019640c99746021f263b26523309..9a63002a85b36672ea93a194ecf49addb88d17cb 100644
--- a/media/mojo/services/mojo_video_decoder_service.h
+++ b/media/mojo/services/mojo_video_decoder_service.h
@@ -9,6 +9,7 @@
 
 #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"
 
@@ -28,7 +29,8 @@ class MojoVideoDecoderService : public mojom::VideoDecoder {
 
   // mojom::VideoDecoder implementation
   void Construct(mojom::VideoDecoderClientAssociatedPtrInfo client,
-                 mojo::ScopedDataPipeConsumerHandle decoder_buffer_pipe) final;
+                 mojo::ScopedDataPipeConsumerHandle decoder_buffer_pipe,
+                 mojom::CommandBufferIdPtr command_buffer_id) final;
   void Initialize(mojom::VideoDecoderConfigPtr config,
                   bool low_delay,
                   const InitializeCallback& callback) final;