Adding momentum/overscroll to views:: ScrollViews

ui/compositor/compositor.h

Index: ui/compositor/compositor.h
diff --git a/ui/compositor/compositor.h b/ui/compositor/compositor.h
index 05c3bcc93eca5df31894d4ea2df99eb154cc043a..cb5a740a72dd91604e92ba9d258f1afd940ff8a6 100644
--- a/ui/compositor/compositor.h
+++ b/ui/compositor/compositor.h
@@ -51,6 +51,7 @@ class TaskGraphRunner;
 
 namespace gfx {
 class Rect;
+class ScrollOffset;
 class Size;
 }
 
@@ -66,6 +67,7 @@ class CompositorVSyncManager;
 class LatencyInfo;
 class Layer;
 class Reflector;
+class UIScrollInputManager;
 class Texture;
 
 const int kCompositorLockTimeoutMs = 67;
@@ -353,6 +355,12 @@ class COMPOSITOR_EXPORT Compositor
     return surface_id_allocator_.get();
   }
 
+  UIScrollInputManager* scroll_input_manager() {
+    return scroll_input_manager_.get();
+  }
+
+  bool ScrollLayerTo(int layer_id, const gfx::ScrollOffset& offset);
+
  private:
   friend class base::RefCounted<Compositor>;
   friend class CompositorLock;
@@ -394,6 +402,8 @@ class COMPOSITOR_EXPORT Compositor
   LayerAnimatorCollection layer_animator_collection_;
   scoped_refptr<cc::AnimationTimeline> animation_timeline_;
 
+  std::unique_ptr<UIScrollInputManager> scroll_input_manager_;
+
   base::WeakPtrFactory<Compositor> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Compositor);