Add Apps.AppListSearchResultDistanceFromOrigin UMA stat.

ui/app_list/views/start_page_view.cc

Index: ui/app_list/views/start_page_view.cc
diff --git a/ui/app_list/views/start_page_view.cc b/ui/app_list/views/start_page_view.cc
index 4e7ec57a7452d739bbf4f7e0a5eaeb06cbb19c51..68131a3dd8e548e2f347719210163ef82ab4d712 100644
--- a/ui/app_list/views/start_page_view.cc
+++ b/ui/app_list/views/start_page_view.cc
@@ -126,6 +126,8 @@ class StartPageView::StartPageTilesContainer
   void UpdateSelectedIndex(int old_selected, int new_selected) override;
   void OnContainerSelected(bool from_bottom,
                            bool directional_movement) override;
+  void NotifyFirstResultYIndex(int y_index) override;
+  int GetYSize() override;
 
  private:
   ContentsView* contents_view_;
@@ -218,6 +220,17 @@ void StartPageView::StartPageTilesContainer::UpdateSelectedIndex(
 void StartPageView::StartPageTilesContainer::OnContainerSelected(
     bool /*from_bottom*/,
     bool /*directional_movement*/) {
+  NOTREACHED();
+}
+
+void StartPageView::StartPageTilesContainer::NotifyFirstResultYIndex(
+    int /*y_index*/) {
+  NOTREACHED();
+}
+
+int StartPageView::StartPageTilesContainer::GetYSize() {
+  NOTREACHED();
+  return 0;
 }
 
 ////////////////////////////////////////////////////////////////////////////////