Introduce ui.dll / libui.so for the component build.

ui/base/models/menu_model.h

 // 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.
 
 #ifndef UI_BASE_MODELS_MENU_MODEL_H_
 #define UI_BASE_MODELS_MENU_MODEL_H_
 #pragma once
 
 #include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "ui/base/models/menu_model_delegate.h"
 #include "ui/gfx/native_widget_types.h"
+#include "ui/ui_api.h"
 
 class SkBitmap;
 
 namespace gfx {
 class Font;
 }
 
 namespace ui {
 
 class Accelerator;
 class ButtonMenuItemModel;
 
 // An interface implemented by an object that provides the content of a menu.
-class MenuModel {
+class UI_API MenuModel {
  public:
   // The type of item.
   enum ItemType {
     TYPE_COMMAND,
     TYPE_CHECK,
     TYPE_RADIO,
     TYPE_SEPARATOR,
     TYPE_BUTTON_ITEM,
     TYPE_SUBMENU
   };
@@ skipping 87 matching lines @@
   // Retrieves the model and index that contains a specific command id. Returns
   // true if an item with the specified command id is found. |model| is inout,
   // and specifies the model to start searching from.
   static bool GetModelAndIndexForCommandId(int command_id, MenuModel** model,
                                            int* index);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_MODELS_MENU_MODEL_H_