Introduces UMA for app-list voice search.

ui/app_list/views/search_result_list_view_delegate.h

Index: ui/app_list/views/search_result_list_view_delegate.h
diff --git a/ui/app_list/views/search_result_list_view_delegate.h b/ui/app_list/views/search_result_list_view_delegate.h
index 405094b31a500071b5b2c3be00cde1c2a3693b0f..e173287b9cee91d9d0541b7a4fab5d8f7ad41326 100644
--- a/ui/app_list/views/search_result_list_view_delegate.h
+++ b/ui/app_list/views/search_result_list_view_delegate.h
@@ -14,9 +14,12 @@ 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