Mark sub-frame root layer non-fast scrollable when wheel handlers present.

third_party/WebKit/public/platform/WebLayerTreeView.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 143 matching lines @@
   // Mutations are plumbed back to the layer tree via the mutator client.
   virtual void setMutatorClient(std::unique_ptr<WebCompositorMutatorClient>) {}
 
   // For when the embedder itself change scales on the page (e.g. devtools)
   // and wants all of the content at the new scale to be crisp.
   virtual void forceRecalculateRasterScales() {}
 
   // Input properties ---------------------------------------------------
   virtual void setEventListenerProperties(WebEventListenerClass,
                                           WebEventListenerProperties) {}
-  virtual void updateTouchRectsForSubframeIfNecessary() {}
+  virtual void updateEventRectsForSubframeIfNecessary() {}
   virtual void setHaveScrollEventHandlers(bool) {}
 
   // Returns the FrameSinkId of the widget associated with this layer tree view.
   virtual cc::FrameSinkId getFrameSinkId() { return cc::FrameSinkId(); }
 
   // Debugging / dangerous ---------------------------------------------
 
   virtual WebEventListenerProperties eventListenerProperties(
       WebEventListenerClass) const {
     return WebEventListenerProperties::Nothing;
@@ skipping 11 matching lines @@
   // Toggles the debug borders on layers
   virtual void setShowDebugBorders(bool) {}
 
   // Toggles scroll bottleneck rects on the HUD layer
   virtual void setShowScrollBottleneckRects(bool) {}
 };
 
 }  // namespace blink
 
 #endif  // WebLayerTreeView_h