Add MediaGpuChannelManager::LookupChannel().

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 7a94c575413c67f3552f8bf84f0800d20123844c..1afa76b19d817572ff80ffb6bdf51c8511e8ec8b 100644
--- a/media/mojo/services/mojo_video_decoder_service.cc
+++ b/media/mojo/services/mojo_video_decoder_service.cc
@@ -31,9 +31,18 @@ MojoVideoDecoderService::~MojoVideoDecoderService() {}
 
 void MojoVideoDecoderService::Construct(
     mojom::VideoDecoderClientAssociatedPtrInfo client,
-    mojo::ScopedDataPipeConsumerHandle decoder_buffer_pipe) {
+    mojo::ScopedDataPipeConsumerHandle decoder_buffer_pipe,
+    mojom::CommandBufferIdPtr command_buffer_id) {
   DVLOG(1) << __func__;
 
+  if (command_buffer_id) {
+    DVLOG(1) << command_buffer_id->channel_token << " : "
+             << command_buffer_id->route_id;
+  } else {
+    DVLOG(1) << "No command_buffer_id";
+  }
+
+  // TODO(sandersd): Enter an error state.
   if (decoder_)
     return;