app_list: Show apps grid after installing from cws result.

ui/app_list/views/search_result_view_delegate.h

Index: ui/app_list/views/search_result_view_delegate.h
diff --git a/ui/app_list/views/search_result_view_delegate.h b/ui/app_list/views/search_result_view_delegate.h
index 079ff446a48934e4b16a874ed4b54e0b7a1db3a5..16b87efbfba642ddff19a86ebcce8f64f92c5e98 100644
--- a/ui/app_list/views/search_result_view_delegate.h
+++ b/ui/app_list/views/search_result_view_delegate.h
@@ -21,6 +21,9 @@ class SearchResultViewDelegate {
                                            size_t action_index,
                                            int event_flags) = 0;
 
+  // Called when the app represented by the search result is installed.
+  virtual void OnSearchResultInstalled(SearchResultView* view) = 0;
+
  protected:
   virtual ~SearchResultViewDelegate() {}
 };