Add IsInternal property to gfx::Display

ui/gfx/display.h

 // Copyright (c) 2012 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_GFX_DISPLAY_H_
 #define UI_GFX_DISPLAY_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/base/ui_export.h"
@@ skipping 83 matching lines @@
   // Returns the display's bounds in pixel coordinates.
   const Rect& bounds_in_pixel() const { return bounds_in_pixel_; }
 #endif
 
   // Returns a string representation of the display;
   std::string ToString() const;
 
   // True if the display contains valid display id.
   bool is_valid() const { return id_ != kInvalidDisplayID; }
 
+  // True if the display corresponds to internal panel.
+  bool IsInternal() const;
+
+  // Gets/Sets an id of display corresponding to internal panel.
+  static int64 InternalDisplayId();
+  static void SetInternalDisplayId(int64 internal_display_id);
+
   static const int64 kInvalidDisplayID;
 
  private:
   int64 id_;
   Rect bounds_;
   Rect work_area_;
 #if defined(USE_AURA)
   Rect bounds_in_pixel_;
 #endif
   float device_scale_factor_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_DISPLAY_H_