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

components/mus/gpu/run_all_shelltests.cc

-// 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.
-
-#include "base/test/launcher/unit_test_launcher.h"
-#include "base/test/test_suite.h"
-#include "build/build_config.h"
-#include "mojo/edk/embedder/embedder.h"
-#include "services/shell/background/background_shell_main.h"
-
-#if defined(USE_OZONE)
-#include "ui/ozone/public/ozone_platform.h"
-#endif
-
-class MusGpuTestSuite : public base::TestSuite {
- public:
-  MusGpuTestSuite(int argc, char** argv) : base::TestSuite(argc, argv) {}
-
- private:
-  void Initialize() override {
-    base::TestSuite::Initialize();
-#if defined(USE_OZONE)
-    ui::OzonePlatform::InitializeForGPU();
-#endif
-  }
-};
-
-int MasterProcessMain(int argc, char** argv) {
-  MusGpuTestSuite test_suite(argc, argv);
-  mojo::edk::Init();
-  return base::LaunchUnitTests(
-      argc, argv,
-      base::Bind(&base::TestSuite::Run, base::Unretained(&test_suite)));
-}