app_list: Improve visual feedback for invalid touch scroll.

ui/app_list/pagination_model.cc

Index: ui/app_list/pagination_model.cc
diff --git a/ui/app_list/pagination_model.cc b/ui/app_list/pagination_model.cc
index cc9e4022dc47002b2726218956d101995cd81bc5..67cb2010e5055891d3672f77f3335b06534af1f3 100644
--- a/ui/app_list/pagination_model.cc
+++ b/ui/app_list/pagination_model.cc
@@ -107,9 +107,10 @@ void PaginationModel::UpdateScroll(double delta) {
   if (progress < 0) {
     clear_transition();
   } else if (progress > 1) {
-    if (is_valid_page(transition_.target_page))
+    if (is_valid_page(transition_.target_page)) {
       SelectPage(transition_.target_page, false);
-    clear_transition();
+      clear_transition();
+    }
   } else {
     transition_.progress = progress;
     NotifyTransitionChanged();