Allow offset for secondary display position in chrome://settings/display.

chrome/browser/ui/webui/options2/chromeos/display_options_handler.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 CHROME_BROWSER_UI_WEBUI_OPTIONS2_CHROMEOS_DISPLAY_OPTIONS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS2_CHROMEOS_DISPLAY_OPTIONS_HANDLER_H_
 
 #include <vector>
 
 #include "chrome/browser/ui/webui/options2/options_ui.h"
@@ skipping 32 matching lines @@
   // configurations.
   void UpdateDisplaySectionVisibility();
 
   // Sends the current display information to the web_ui of options page.
   void SendDisplayInfo();
 
   // Called when the fade-out animation for mirroring status change is finished.
   void FadeOutForMirroringFinished(bool is_mirroring);
 
   // Called when the fade-out animation for secondary display layout change is
-  // finished.
-  void FadeOutForDisplayLayoutFinished(int layout);
+  // finished.  |layout| specifies the four positions of the secondary display
+  // (left/right/top/bottom), and |offset| is the offset length from the
+  // left/top edge of the primary display.
+  void FadeOutForDisplayLayoutFinished(int layout, int offset);
 
   // Handlers of JS messages.
   void HandleDisplayInfo(const base::ListValue* unused_args);
   void HandleMirroring(const base::ListValue* args);
   void HandleDisplayLayout(const base::ListValue* args);
 
   DISALLOW_COPY_AND_ASSIGN(DisplayOptionsHandler);
 };
 
 }  // namespace options2
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS2_CHROMEOS_DISPLAY_OPTIONS_HANDLER_H_