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

ui/app_list/app_list_view_delegate.h

Index: ui/app_list/app_list_view_delegate.h
diff --git a/ui/app_list/app_list_view_delegate.h b/ui/app_list/app_list_view_delegate.h
index 159d6166aa1f44fb3bdedfa43811d7696d16ca0c..d7e0c82f638e881b910223d7609aebba7054700f 100644
--- a/ui/app_list/app_list_view_delegate.h
+++ b/ui/app_list/app_list_view_delegate.h
@@ -38,6 +38,12 @@ class APP_LIST_EXPORT AppListViewDelegate {
   virtual void OpenSearchResult(const SearchResult& result,
                                 int event_flags) = 0;
 
+  // Called to invoke a custom action on |result|.  |action_index| corresponds
+  // to the index of an icon in |result.action_icons()|.
+  virtual void InvokeSearchResultAction(const SearchResult& result,
+                                        int action_index,
+                                        int event_flags) = 0;
+
   // Invoked to close app list.
   virtual void Close() = 0;
 };