[not for review - epic CL] Adding Elastic+Momentum+Layered scrolling to views::ScrollView

ui/views/controls/scroll_view.h

Index: ui/views/controls/scroll_view.h
diff --git a/ui/views/controls/scroll_view.h b/ui/views/controls/scroll_view.h
index 5f55c20d31b7d1bd0aeb883103ae693a73291488..d07c1ed308f89df27674e7b982efbf25fa3ba2e0 100644
--- a/ui/views/controls/scroll_view.h
+++ b/ui/views/controls/scroll_view.h
@@ -105,6 +105,7 @@ class VIEWS_EXPORT ScrollView : public View, public ScrollBarController {
   int GetScrollIncrement(ScrollBar* source,
                          bool is_page,
                          bool is_positive) override;
+  void OnScrollEventFromScrollBar(ui::ScrollEvent* event) override;
 
  private:
   friend class test::ScrollViewTestApi;