gpu: Introduce GpuChannelEstablishFactory.

ui/views/mus/window_manager_connection.h

 // Copyright 2015 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.
 
 #ifndef UI_VIEWS_MUS_WINDOW_MANAGER_CONNECTION_H_
 #define UI_VIEWS_MUS_WINDOW_MANAGER_CONNECTION_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 42 matching lines @@
  public:
   ~WindowManagerConnection() override;
 
   static std::unique_ptr<WindowManagerConnection> Create(
       shell::Connector* connector,
       const shell::Identity& identity);
   static WindowManagerConnection* Get();
   static bool Exists();
 
   shell::Connector* connector() { return connector_; }
+  ui::GpuService* gpu_service() { return gpu_service_.get(); }
 
   ui::Window* NewWindow(
       const std::map<std::string, std::vector<uint8_t>>& properties);
 
   NativeWidget* CreateNativeWidgetMus(
       const std::map<std::string, std::vector<uint8_t>>& properties,
       const Widget::InitParams& init_params,
       internal::NativeWidgetDelegate* delegate);
 
   void AddPointerWatcher(PointerWatcher* watcher);
@@ skipping 31 matching lines @@
   // Must be empty on destruction.
   base::ObserverList<PointerWatcher, true> pointer_watchers_;
   base::ObserverList<TouchEventWatcher, true> touch_event_watchers_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManagerConnection);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_MUS_WINDOW_MANAGER_CONNECTION_H_