app_list: Show apps grid after installing from cws result.

ui/app_list/search_result.cc

Index: ui/app_list/search_result.cc
diff --git a/ui/app_list/search_result.cc b/ui/app_list/search_result.cc
index a624203a53aea27e3a9611bb6ea55c12eb6c626b..ab40d31e78419c52cd177788c833252ec71f2ab0 100644
--- a/ui/app_list/search_result.cc
+++ b/ui/app_list/search_result.cc
@@ -62,6 +62,12 @@ void SearchResult::SetPercentDownloaded(int percent_downloaded) {
                     OnPercentDownloadedChanged());
 }
 
+void SearchResult::NotifyItemInstalled() {
+  FOR_EACH_OBSERVER(SearchResultObserver,
+                    observers_,
+                    OnItemInstalled());
+}
+
 void SearchResult::AddObserver(SearchResultObserver* observer) {
   observers_.AddObserver(observer);
 }