Converts chrome to aura-mus

ui/views/mus/mus_client.h

 // 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.
 
 #ifndef UI_VIEWS_MUS_MUS_CLIENT_H_
 #define UI_VIEWS_MUS_MUS_CLIENT_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 40 matching lines @@
 namespace internal {
 class NativeWidgetDelegate;
 }
 
 namespace test {
 class MusClientTestApi;
 }
 
 // MusClient establishes a connection to mus and sets up necessary state so that
 // aura and views target mus. This class is useful for typical clients, not the
-// WindowManager. This class is created by AuraInit when
-// AuraInit::Mode::AURA_MUS is passed as the mode.
-// AuraInit::Mode::AURA to AuraInit and MusClient will be created for us.
+// WindowManager. Most clients don't create this directly, rather use
+// AuraInit.
 class VIEWS_MUS_EXPORT MusClient
     : public aura::WindowTreeClientDelegate,
       public ScreenMusDelegate,
       public ui::OSExchangeDataProviderFactory::Factory {
  public:
+  // Most clients should use AuraInit, which creates a MusClient.
+  // |create_wm_state| indicates whether MusClient should create a wm::WMState.
+  MusClient(
+      service_manager::Connector* connector,
+      const service_manager::Identity& identity,
+      scoped_refptr<base::SingleThreadTaskRunner> io_task_runner = nullptr,
+      bool create_wm_state = true);
   ~MusClient() override;
 
   static MusClient* Get() { return instance_; }
+  static bool Exists() { return instance_ != nullptr; }
 
   // Returns true if a DesktopNativeWidgetAura should be created given the
   // specified params. If this returns false a NativeWidgetAura should be
   // created.
   static bool ShouldCreateDesktopNativeWidgetAura(
       const Widget::InitParams& init_params);
 
   // Returns the properties to supply to mus when creating a window.
   static std::map<std::string, std::vector<uint8_t>>
   ConfigurePropertiesFromParams(const Widget::InitParams& init_params);
 
   aura::WindowTreeClient* window_tree_client() {
     return window_tree_client_.get();
   }
 
   PointerWatcherEventRouter2* pointer_watcher_event_router() {
     return pointer_watcher_event_router_.get();
   }
 
+  ui::Gpu* gpu() { return gpu_.get(); }
+
   // Creates DesktopNativeWidgetAura with DesktopWindowTreeHostMus. This is
   // set as the factory function used for creating NativeWidgets when a
   //  NativeWidget has not been explicitly set.
   NativeWidget* CreateNativeWidget(const Widget::InitParams& init_params,
                                    internal::NativeWidgetDelegate* delegate);
 
   void AddObserver(MusClientObserver* observer);
   void RemoveObserver(MusClientObserver* observer);
 
  private:
   friend class AuraInit;
   friend class test::MusClientTestApi;
 
-  MusClient(
-      service_manager::Connector* connector,
-      const service_manager::Identity& identity,
-      scoped_refptr<base::SingleThreadTaskRunner> io_task_runner = nullptr);
-
   // aura::WindowTreeClientDelegate:
   void OnEmbed(
       std::unique_ptr<aura::WindowTreeHostMus> window_tree_host) override;
   void OnLostConnection(aura::WindowTreeClient* client) override;
   void OnEmbedRootDestroyed(aura::WindowTreeHostMus* window_tree_host) override;
   void OnPointerEventObserved(const ui::PointerEvent& event,
                               aura::Window* target) override;
   aura::client::CaptureClient* GetCaptureClient() override;
   aura::PropertyConverter* GetPropertyConverter() override;
 
   // ScreenMusDelegate:
   void OnWindowManagerFrameValuesChanged() override;
   gfx::Point GetCursorScreenPoint() override;
   aura::Window* GetWindowAtScreenPoint(const gfx::Point& point) override;
 
   // ui:OSExchangeDataProviderFactory::Factory:
   std::unique_ptr<OSExchangeData::Provider> BuildProvider() override;
 
   static MusClient* instance_;
 
   service_manager::Identity identity_;
 
   base::ObserverList<MusClientObserver> observer_list_;
 
+  // NOTE: this may be null (creation is based on argument supplied to
+  // constructor).
   std::unique_ptr<wm::WMState> wm_state_;
 
   std::unique_ptr<ScreenMus> screen_;
 
   std::unique_ptr<aura::PropertyConverter> property_converter_;
 
   std::unique_ptr<aura::WindowTreeClient> window_tree_client_;
 
   std::unique_ptr<ui::Gpu> gpu_;
 
   std::unique_ptr<PointerWatcherEventRouter2> pointer_watcher_event_router_;
 
   std::unique_ptr<aura::MusContextFactory> compositor_context_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MusClient);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_MUS_MUS_CLIENT_H_