Add GetActiveScreen to DisplayInfoProvider

chrome/browser/extensions/display_info_provider_chromeos.cc

 // 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.
 
 #include "chrome/browser/extensions/display_info_provider_chromeos.h"
 
 #include "ash/display/display_controller.h"
 #include "ash/display/display_manager.h"
 #include "ash/shell.h"
 #include "base/message_loop/message_loop_proxy.h"
@@ skipping 362 matching lines @@
   unit->dpi_y = dpi;
 
   const gfx::Insets overscan_insets =
       display_manager->GetOverscanInsets(display.id());
   unit->overscan.left = overscan_insets.left();
   unit->overscan.top = overscan_insets.top();
   unit->overscan.right = overscan_insets.right();
   unit->overscan.bottom = overscan_insets.bottom();
 }
 
+gfx::Screen* DisplayInfoProviderChromeOS::GetActiveScreen() {
+  return ash::Shell::GetScreen();
+}
+
 // static
 DisplayInfoProvider* DisplayInfoProvider::Create() {
   return new DisplayInfoProviderChromeOS();
 }
 
 }  // namespace extensions