Example MojoVideoDecoder decoder using the command buffer.

media/renderers/gpu_video_accelerator_factories.h

Index: media/renderers/gpu_video_accelerator_factories.h
diff --git a/media/renderers/gpu_video_accelerator_factories.h b/media/renderers/gpu_video_accelerator_factories.h
index 6bae2a5e4f2fc68933fa376eeb10ec843e5eeb54..9de0a402b6cdec337c5b3f2b3fe3b92397336201 100644
--- a/media/renderers/gpu_video_accelerator_factories.h
+++ b/media/renderers/gpu_video_accelerator_factories.h
@@ -74,6 +74,9 @@ class MEDIA_EXPORT GpuVideoAcceleratorFactories {
   // Return the channel token, or an empty token if the channel is unusable.
   virtual base::UnguessableToken GetChannelToken() = 0;
 
+  // Returns the |route_id| of the command buffer.
+  virtual int32_t GetCommandBufferRouteId() = 0;
+
   // Caller owns returned pointer, but should call Destroy() on it (instead of
   // directly deleting) for proper destruction, as per the
   // VideoDecodeAccelerator interface.