Makes ash/mus use RootWindowControllerCommon

ash/mus/bridge/wm_window_mus.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 ASH_MUS_BRIDGE_WM_WINDOW_MUS_H_
 #define ASH_MUS_BRIDGE_WM_WINDOW_MUS_H_
 
 #include <memory>
 
+#include "ash/common/shell_window_ids.h"
 #include "ash/common/wm_window.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "components/mus/public/cpp/window_observer.h"
 
 namespace views {
 class Widget;
 }
 
 namespace ash {
@@ skipping 197 matching lines @@
       const std::vector<uint8_t>* new_data) override;
   void OnWindowBoundsChanged(::mus::Window* window,
                              const gfx::Rect& old_bounds,
                              const gfx::Rect& new_bounds) override;
   void OnWindowDestroying(::mus::Window* window) override;
 
   ::mus::Window* window_;
 
   // The shell window id of this window. Shell window ids are defined in
   // ash/common/shell_window_ids.h.
-  int shell_window_id_ = -1;
+  int shell_window_id_ = kShellWindowId_Invalid;
 
   std::unique_ptr<wm::WindowState> window_state_;
 
   views::Widget* widget_ = nullptr;
 
   WidgetCreationType widget_creation_type_ = WidgetCreationType::INTERNAL;
 
   base::ObserverList<WmWindowObserver> observers_;
 
   std::unique_ptr<MusLayoutManagerAdapter> layout_manager_adapter_;
 
   std::unique_ptr<gfx::Rect> restore_bounds_in_screen_;
 
   ui::WindowShowState restore_show_state_ = ui::SHOW_STATE_DEFAULT;
 
   bool snap_children_to_pixel_boundary_ = false;
 
   // If true child windows should get a slightly larger hit region to make
   // resizing easier.
   bool children_use_extended_hit_region_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(WmWindowMus);
 };
 
 }  // namespace mus
 }  // namespace ash
 
 #endif  // ASH_MUS_BRIDGE_WM_WINDOW_MUS_H_