Add GetActiveScreen to DisplayInfoProvider

chrome/browser/extensions/display_info_provider_win.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_win.h"
 
 #include <windows.h>
 
 #include "base/hash.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 62 matching lines @@
   for (size_t i = 0; i < all_displays.size(); ++i) {
     if (unit->id == all_displays[i]->id) {
       unit->name = all_displays[i]->name;
       unit->dpi_x = all_displays[i]->dpi_x;
       unit->dpi_y = all_displays[i]->dpi_y;
       break;
     }
   }
 }
 
+gfx::Screen* DisplayInfoProviderWin::GetActiveScreen() {
+  return NULL;
+}
+
 // static
 DisplayInfoProvider* DisplayInfoProvider::Create() {
   return new DisplayInfoProviderWin();
 }
 
 }  // namespace extensions