Add IsInternal property to gfx::Display

ash/system/chromeos/tray_display.cc

 // 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.
 
 #include "ash/system/chromeos/tray_display.h"
 
 #include "ash/display/display_controller.h"
 #include "ash/display/display_manager.h"
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
@@ skipping 68 matching lines @@
       default:
         NOTREACHED();
     }
   }
 
  private:
   // Returns the name of the currently connected external display.
   string16 GetExternalDisplayName() {
 #if defined(USE_X11)
     DisplayManager* display_manager = Shell::GetInstance()->display_manager();
-    int64 internal_display_id = display_manager->internal_display_id();
+    int64 internal_display_id = gfx::Display::internal_display_id();
     int64 primary_display_id =
         gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().id();
 
     // Use xrandr features rather than DisplayManager to find out the external
     // display's name. DisplayManager's API doesn't work well in mirroring mode
     // since it's based on gfx::Display but in mirroring mode there's only one
     // gfx::Display instance which represents both displays.
     std::vector<XID> outputs;
     ui::GetOutputDeviceHandles(&outputs);
     for (size_t i = 0; i < outputs.size(); ++i) {
@@ skipping 83 matching lines @@
     default_->Update();
 }
 
 void TrayDisplay::OnDisplayModeChanged() {
   if (default_)
     default_->Update();
 }
 
 }  // namespace internal
 }  // namespace ash