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

ui/base/models/button_menu_item_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_BUTTON_MENU_ITEM_MODEL_H_
 #define UI_BASE_MODELS_BUTTON_MENU_ITEM_MODEL_H_
 #pragma once
 
 #include <vector>
 
 #include "base/string16.h"
+#include "ui/ui_api.h"
 
 namespace ui {
 
 // A model representing the rows of buttons that should be inserted in a button
 // containing menu item.
-class ButtonMenuItemModel {
+class UI_API ButtonMenuItemModel {
  public:
   // Types of buttons.
   enum ButtonType {
     TYPE_SPACE,
     TYPE_BUTTON,
     TYPE_BUTTON_LABEL
   };
 
-  class Delegate {
+  class UI_API Delegate {
    public:
     // Some command ids have labels that change over time.
     virtual bool IsItemForCommandIdDynamic(int command_id) const;
     virtual string16 GetLabelForCommandId(int command_id) const;
 
     // Performs the action associated with the specified command id.
     virtual void ExecuteCommand(int command_id) = 0;
     virtual bool IsCommandIdEnabled(int command_id) const;
     virtual bool DoesCommandIdDismissMenu(int command_id) const;
 
@@ skipping 67 matching lines @@
   std::vector<Item> items_;
 
   Delegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ButtonMenuItemModel);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_MODELS_BUTTON_MENU_ITEM_MODEL_H_