Add MenuModelAdapter to wrap ui::MenuModel with views::MenuDelegate interface.

ui/base/models/menu_model.cc

 // Copyright (c) 2011 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 "ui/base/models/menu_model.h"
 
 namespace ui {
 
 int MenuModel::GetFirstItemIndex(gfx::NativeMenu native_menu) const {
   return 0;
 }
 
 bool MenuModel::IsVisibleAt(int index) const {
   return true;
 }
 
 bool MenuModel::GetModelAndIndexForCommandId(int command_id,
                                              MenuModel** model, int* index) {
-  int item_count = (*model)->GetItemCount();
+  const int item_count = (*model)->GetItemCount();
+  const int index_offset = (*model)->GetFirstItemIndex(NULL);
   for (int i = 0; i < item_count; ++i) {
-    if ((*model)->GetTypeAt(i) == TYPE_SUBMENU) {
-      MenuModel* submenu_model = (*model)->GetSubmenuModelAt(i);
+    const int candidate_index = i + index_offset;
+    if ((*model)->GetTypeAt(candidate_index) == TYPE_SUBMENU) {
+      MenuModel* submenu_model = (*model)->GetSubmenuModelAt(candidate_index);
       if (GetModelAndIndexForCommandId(command_id, &submenu_model, index)) {
         *model = submenu_model;
         return true;
       }
     }
-    if ((*model)->GetCommandIdAt(i) == command_id) {
-      *index = i;
+    if ((*model)->GetCommandIdAt(candidate_index) == command_id) {
+      *index = candidate_index;
       return true;
     }
   }
   return false;
 }
 
 const gfx::Font* MenuModel::GetLabelFontAt(int index) const {
   return NULL;
 }
 
 // Default implementation ignores the disposition.
 void MenuModel::ActivatedAtWithDisposition(int index, int disposition) {
   ActivatedAt(index);
 }
 
 }  // namespace ui