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

ash/shell/app_list.cc

Index: ash/shell/app_list.cc
diff --git a/ash/shell/app_list.cc b/ash/shell/app_list.cc
index 40215ae934af14a8b46e13d087f4f2b0252217a8..0ad18aa70d02dae162e39bc959d47f0e2a327635 100644
--- a/ash/shell/app_list.cc
+++ b/ash/shell/app_list.cc
@@ -240,6 +240,12 @@ class ExampleAppListViewDelegate : public app_list::AppListViewDelegate {
     WindowTypeLauncherItem::Activate(example_result->type(), event_flags);
   }
 
+  virtual void InvokeSearchResultAction(const app_list::SearchResult& result,
+                                        int action_index,
+                                        int event_flags) OVERRIDE {
+    NOTIMPLEMENTED();
+  }
+
   virtual void StartSearch() OVERRIDE {
     string16 query;
     TrimWhitespace(model_->search_box()->text(), TRIM_ALL, &query);