Refators display related functionality into own class

components/mus/ws/server_window_delegate.h

 // Copyright 2014 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 COMPONENTS_MUS_WS_SERVER_WINDOW_DELEGATE_H_
 #define COMPONENTS_MUS_WS_SERVER_WINDOW_DELEGATE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "components/mus/public/interfaces/mus_constants.mojom.h"
 #include "components/mus/public/interfaces/window_tree.mojom.h"
 
 namespace mus {
 
 class SurfacesState;
 
 namespace ws {
 
 struct ClientWindowId;
 class ServerWindow;
 struct WindowId;
 
 class ServerWindowDelegate {
  public:
   virtual SurfacesState* GetSurfacesState() = 0;
 
-  virtual void OnScheduleWindowPaint(const ServerWindow* window) = 0;
+  virtual void OnScheduleWindowPaint(ServerWindow* window) = 0;
 
   // Returns the root of the window tree to which this |window| is attached.
   // Returns null if this window is not attached up through to a root window.
   virtual const ServerWindow* GetRootWindow(
       const ServerWindow* window) const = 0;
 
   // Schedules a callback to DestroySurfacesScheduledForDestruction() at the
   // appropriate time, which may be synchronously.
   virtual void ScheduleSurfaceDestruction(ServerWindow* window) = 0;
 
@@ skipping 10 matching lines @@
 
  protected:
   virtual ~ServerWindowDelegate() {}
 };
 
 }  // namespace ws
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_SERVER_WINDOW_DELEGATE_H_