Refactors StackingController::GetDefaultParent to ash/wm/common

ash/wm/common/wm_window.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_WM_COMMON_WM_WINDOW_H_
 #define ASH_WM_COMMON_WM_WINDOW_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 69 matching lines @@
   virtual gfx::Size GetMinimumSize() const = 0;
   virtual gfx::Size GetMaximumSize() const = 0;
 
   // Returns the visibility requested by this window. IsVisible() takes into
   // account the visibility of the layer and ancestors, where as this tracks
   // whether Show() without a Hide() has been invoked.
   virtual bool GetTargetVisibility() const = 0;
 
   virtual bool IsVisible() const = 0;
 
+  virtual bool IsSystemModal() const = 0;
+
   virtual bool GetBoolProperty(WmWindowProperty key) = 0;
   virtual int GetIntProperty(WmWindowProperty key) = 0;
 
   WindowState* GetWindowState() {
     return const_cast<WindowState*>(
         const_cast<const WmWindow*>(this)->GetWindowState());
   }
   virtual const WindowState* GetWindowState() const = 0;
 
   virtual WmWindow* GetToplevelWindow() = 0;
@@ skipping 94 matching lines @@
   virtual void RemoveObserver(WmWindowObserver* observer) = 0;
 
  protected:
   virtual ~WmWindow() {}
 };
 
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_WM_COMMON_WM_WINDOW_H_