Simplifies the structure of app_list search a bit.

ui/app_list/search_result.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 UI_APP_LIST_SEARCH_RESULT_H_
 #define UI_APP_LIST_SEARCH_RESULT_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 100 matching lines @@
 
   // Returns the dimension at which this result's icon should be displayed.
   int GetPreferredIconDimension() const;
 
   void NotifyItemInstalled();
   void NotifyItemUninstalled();
 
   void AddObserver(SearchResultObserver* observer);
   void RemoveObserver(SearchResultObserver* observer);
 
+  // TODO(mukai): Remove this method and really simplify the ownership of
+  // SearchResult. Ideally, SearchResult will be copyable.
+  virtual scoped_ptr<SearchResult> Duplicate() = 0;
+
   // Opens the result.
   virtual void Open(int event_flags);
 
-  // Invokes a custom action on the result.
+  // Invokes a custom action on the result. It does nothing by default.
   virtual void InvokeAction(int action_index, int event_flags);
 
   // Returns the context menu model for this item, or NULL if there is currently
   // no menu for the item (e.g. during install).
   // Note the returned menu model is owned by this item.
   virtual ui::MenuModel* GetContextMenuModel();
 
  protected:
   void set_id(const std::string& id) { id_ = id; }
   void set_relevance(double relevance) { relevance_ = relevance; }
@@ skipping 20 matching lines @@
   int percent_downloaded_;
 
   ObserverList<SearchResultObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchResult);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_SEARCH_RESULT_H_