Add mojom::DisplayController.

services/ui/display/platform_screen_delegate.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 SERVICES_UI_DISPLAY_PLATFORM_SCREEN_DELEGATE_H_
 #define SERVICES_UI_DISPLAY_PLATFORM_SCREEN_DELEGATE_H_
 
 #include <stdint.h>
 
 namespace gfx {
 class Rect;
 }
 
 namespace display {
 
 class PlatformScreen;
 
 // The PlatformScreenDelegate will be informed of changes to the physical
 // and/or virtual displays by PlatformScreen.
 class PlatformScreenDelegate {
  public:
   // TODO(kylechar): We need to provide more than just the window bounds when
   // displays are added or modified.
 
   // Called when a display is added. |bounds| is in DIP.
-  virtual void OnDisplayAdded(PlatformScreen* platform_screen,
-                              int64_t id,
-                              const gfx::Rect& bounds) = 0;
+  virtual void OnDisplayAdded(int64_t id, const gfx::Rect& bounds) = 0;
 
   // Called when a display is removed.
   virtual void OnDisplayRemoved(int64_t id) = 0;
 
   // Called when a display is modified. |bounds| is in DIP.
   virtual void OnDisplayModified(int64_t id, const gfx::Rect& bounds) = 0;
 
  protected:
   virtual ~PlatformScreenDelegate() {}
 };
 
 }  // namespace display
 
 #endif  // SERVICES_UI_DISPLAY_PLATFORM_SCREEN_DELEGATE_H_