Sort experimental app list search result groups.

ui/app_list/views/search_result_page_view.h

Index: ui/app_list/views/search_result_page_view.h
diff --git a/ui/app_list/views/search_result_page_view.h b/ui/app_list/views/search_result_page_view.h
index 42d9054abb376c084b68d8505f74109360cfbe1e..503d9991de6e378c11864e6ab256d23a7e8a5a33 100644
--- a/ui/app_list/views/search_result_page_view.h
+++ b/ui/app_list/views/search_result_page_view.h
@@ -31,6 +31,10 @@ class APP_LIST_EXPORT SearchResultPageView : public views::View {
       AppListModel::SearchResults* result_model,
       SearchResultContainerView* result_container);
 
+  const std::vector<SearchResultContainerView*>& result_container_views() {
+    return result_container_views_;
+  }
+
   // Overridden from views::View:
   bool OnKeyPressed(const ui::KeyEvent& event) override;
   void ChildPreferredSizeChanged(views::View* child) override;