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

components/mus/gpu/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.
 
 import("//mojo/public/mojo_application_manifest.gni")
 import("//testing/test.gni")
 
 source_set("gpu") {
   output_name = "mus_gpu"
 
   sources = [
+    "gpu_memory_buffer_manager_mus_local.cc",
+    "gpu_memory_buffer_manager_mus_local.h",
+    "gpu_service_impl.cc",
+    "gpu_service_impl.h",
     "gpu_service_mus.cc",
     "gpu_service_mus.h",
   ]
 
   deps = [
+    "//components/mus/common:mus_common",
     "//components/mus/public/interfaces",
     "//gpu/ipc/common",
     "//gpu/ipc/service",
     "//ipc",
+    "//media/gpu/ipc/service",
     "//mojo/public/cpp/system",
+    "//services/shell/public/cpp",
     "//ui/gfx:memory_buffer",
+    "//ui/gl/init",
   ]
 }
 
 group("tests") {
   testonly = true
   deps = [
     ":mus_gpu_unittests",
   ]
 }
 
@@ skipping 10 matching lines @@
 
   data_deps = [
     ":mus_gpu_unittests_app_manifest",
   ]
 }
 
 mojo_application_manifest("mus_gpu_unittests_app_manifest") {
   application_name = "mus_gpu_unittests_app"
   source = "mus_gpu_unittests_app_manifest.json"
 }