Impl mus::mojom::GpuService to enable using Chrome IPC version gpu CmdBuf in mus

media/gpu/ipc/service/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 source_set("service") {
   visibility = [
     "//media/*",
     "//content/gpu/*",
     "//content/public/gpu/*",
+    "//components/mus/gpu/*",
   ]
 
   sources = [
     "gpu_jpeg_decode_accelerator.cc",
     "gpu_jpeg_decode_accelerator.h",
     "gpu_video_decode_accelerator.cc",
     "gpu_video_decode_accelerator.h",
     "gpu_video_encode_accelerator.cc",
     "gpu_video_encode_accelerator.h",
     "media_channel.cc",
@@ skipping 22 matching lines @@
   }
 
   if (is_win) {
     configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
   }
 
   if (is_mac) {
     deps += [ "//third_party/webrtc/common_video:common_video" ]
   }
 }