Adding momentum/overscroll to views:: ScrollViews

ui/compositor/layer.h

Index: ui/compositor/layer.h
diff --git a/ui/compositor/layer.h b/ui/compositor/layer.h
index 95c72a06dd0261365d4e5cac9aea96ad3fdaef4d..83f552f8b10df90b0ffcdbfb3c70a3a34feb2812 100644
--- a/ui/compositor/layer.h
+++ b/ui/compositor/layer.h
@@ -384,6 +384,12 @@ class COMPOSITOR_EXPORT Layer
     return damaged_region_;
   }
 
+  gfx::ScrollOffset CurrentScrollOffset() const;
+  void SetScrollOffset(const gfx::ScrollOffset& offset);
+  void SetScrollable(Layer* parent_clip_layer,
+                     bool can_overscroll,
+                     const base::Closure& on_scroll);
+
  private:
   friend class LayerOwner;