ash: Add support for additional icons in apps search list.

ui/app_list/search_result_list_view_delegate.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_LIST_VIEW_DELEGATE_H_
 #define UI_APP_LIST_SEARCH_RESULT_LIST_VIEW_DELEGATE_H_
 
 #include "ui/app_list/app_list_export.h"
 
 namespace app_list {
 
 class SearchResult;
 
 class APP_LIST_EXPORT SearchResultListViewDelegate {
  public:
   // Invoked to open given |result|. |event_flags| contains the flags of the
   // keyboard/mouse event that triggers the "open" request. Delegate could use
   // the |event_flags| information to choose different ways to open the result.
   virtual void OpenResult(const SearchResult& result,
                           int event_flags) = 0;
 
+  // Called to invoke a custom action on |result|.  |action_index| corresponds
+  // to the index of the icon in |result.action_icons()| that was activated.
+  virtual void InvokeResultAction(const SearchResult& result,
+                                  int action_index,
+                                  int event_flags) = 0;
+
  protected:
   virtual ~SearchResultListViewDelegate() {}
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_SEARCH_RESULT_LIST_VIEW_DELEGATE_H_