Implement Action Box button

chrome/browser/ui/view_ids.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.
 
 // This defines an enumeration of IDs that can uniquely identify a view within
 // the scope of a container view.
 
 #ifndef CHROME_BROWSER_UI_VIEW_IDS_H_
 #define CHROME_BROWSER_UI_VIEW_IDS_H_
 #pragma once
@@ skipping 57 matching lines @@
   VIEW_ID_CONTENTS_SPLIT,
 
   // The Infobar container.
   VIEW_ID_INFO_BAR_CONTAINER,
 
   // The Download shelf.
   VIEW_ID_DOWNLOAD_SHELF,
 
   // Used in chrome/browser/ui/gtk/view_id_util_browsertests.cc
   // If you add new ids, make sure the above test passes.
-  VIEW_ID_PREDEFINED_COUNT
+  VIEW_ID_PREDEFINED_COUNT,
+
+  // Plus button on location bar.
+  VIEW_ID_ACTION_BOX_BUTTON
 };
 
 #endif  // CHROME_BROWSER_UI_VIEW_IDS_H_