Add Apps.AppListSearchResultDistanceFromOrigin UMA stat.

ui/app_list/views/search_result_page_view.cc

Index: ui/app_list/views/search_result_page_view.cc
diff --git a/ui/app_list/views/search_result_page_view.cc b/ui/app_list/views/search_result_page_view.cc
index 3a1e935dd0c0415c8a597d8f22f361f848e0ce80..52cbe53140da70f86b6b2022828401eb19a5dbf8 100644
--- a/ui/app_list/views/search_result_page_view.cc
+++ b/ui/app_list/views/search_result_page_view.cc
@@ -157,9 +157,17 @@ void SearchResultPageView::ChildPreferredSizeChanged(views::View* child) {
                 return a->container_score() > b->container_score();
               });
 
+    int result_y_index = 0;
     for (size_t i = 0; i < result_container_views_.size(); ++i) {
-      result_container_views_[i]->ClearSelectedIndex();
-      ReorderChildView(result_container_views_[i]->parent(), i);
+      SearchResultContainerView* view = result_container_views_[i];
+      view->ClearSelectedIndex();
+      ReorderChildView(view->parent(), i);
+
+      // Only notify containers that have finished updating.
+      if (!view->UpdateScheduled())
+        view->NotifyFirstResultYIndex(result_y_index);
+
+      result_y_index += view->GetYSize();
     }
   }