mus::GpuService: Support establish GpuChannel asynchronously.

components/mus/demo/mus_demo.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 "components/mus/demo/mus_demo.h"
 
 #include "base/time/time.h"
 #include "components/bitmap_uploader/bitmap_uploader.h"
+#include "components/mus/common/gpu_service.h"
 #include "components/mus/public/cpp/window.h"
 #include "components/mus/public/cpp/window_tree_client.h"
 #include "services/shell/public/cpp/connector.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkImageInfo.h"
 #include "third_party/skia/include/core/SkPaint.h"
 #include "third_party/skia/include/core/SkRect.h"
 #include "ui/gfx/geometry/rect.h"
 
@@ skipping 40 matching lines @@
 MusDemo::MusDemo() {}
 
 MusDemo::~MusDemo() {
   delete window_tree_client_;
 }
 
 void MusDemo::Initialize(shell::Connector* connector,
                          const shell::Identity& identity,
                          uint32_t id) {
   connector_ = connector;
+  mus::GpuService::GetInstance()->Initialize(connector_);
   window_tree_client_ = new mus::WindowTreeClient(this, this, nullptr);
   window_tree_client_->ConnectAsWindowManager(connector);
 }
 
 bool MusDemo::AcceptConnection(shell::Connection* connection) {
   return true;
 }
 
 void MusDemo::OnEmbed(mus::Window* window) {
   // Not called for the WindowManager.
@@ skipping 89 matching lines @@
   std::unique_ptr<std::vector<unsigned char>> data(
       new std::vector<unsigned char>(addr, addr + bytes));
   bitmap_.unlockPixels();
 
   // Send frame to MUS via BitmapUploader.
   uploader_->SetBitmap(bounds.width(), bounds.height(), std::move(data),
                        bitmap_uploader::BitmapUploader::BGRA);
 }
 
 }  // namespace mus_demo