Introduces UMA for app-list voice search.

ui/app_list/views/search_result_list_view_delegate.h

 // Copyright 2013 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_VIEWS_SEARCH_RESULT_LIST_VIEW_DELEGATE_H_
 #define UI_APP_LIST_VIEWS_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.
+  // keyboard/mouse event that triggers the "open" request. |auto_launch| is
+  // true when the result is opened automatically through voice-search. Delegate
+  // could use the |event_flags| information to choose different ways to open
+  // the result.
   virtual void OpenResult(SearchResult* result,
+                          bool auto_launch,
                           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(SearchResult* result,
                                   int action_index,
                                   int event_flags) = 0;
 
   // Called when the app represented by |result| is installed.
   virtual void OnResultInstalled(SearchResult* result) = 0;
 
   // Called when the app represented by |result| is uninstalled.
   virtual void OnResultUninstalled(SearchResult* result) = 0;
 
  protected:
   virtual ~SearchResultListViewDelegate() {}
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_SEARCH_RESULT_LIST_VIEW_DELEGATE_H_