Move have_wheel_event_handlers to WebLayerTreeView.

third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp

 /*
  * Copyright (C) 2011 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 662 matching lines @@
         clipParentWebLayer = toWebLayer(parent->compositedLayerMapping()->parentForSublayers());
 
     child->setClipParent(clipParentWebLayer);
 }
 
 void ScrollingCoordinator::willDestroyLayer(PaintLayer* layer)
 {
     m_layersWithTouchRects.remove(layer);
 }
 
-void ScrollingCoordinator::updateHaveWheelEventHandlers()
-{
-    ASSERT(isMainThread());
-    ASSERT(m_page);
-    if (!m_page->mainFrame()->isLocalFrame() || !m_page->deprecatedLocalMainFrame()->view())
-        return;
-
-    if (WebLayer* scrollLayer = toWebLayer(m_page->deprecatedLocalMainFrame()->view()->layerForScrolling())) {
-        bool haveHandlers = m_page->frameHost().eventHandlerRegistry().hasEventHandlers(EventHandlerRegistry::WheelEvent);
-        scrollLayer->setHaveWheelEventHandlers(haveHandlers);
-    }
-}
-
 void ScrollingCoordinator::updateHaveScrollEventHandlers()
 {
     ASSERT(isMainThread());
     ASSERT(m_page);
     if (!m_page->mainFrame()->isLocalFrame() || !m_page->deprecatedLocalMainFrame()->view())
         return;
 
     // Currently the compositor only cares whether there are scroll handlers anywhere on the page
     // instead on a per-layer basis. We therefore only update this information for the root
     // scrolling layer.
@@ skipping 247 matching lines @@
 
 void ScrollingCoordinator::frameViewRootLayerDidChange(FrameView* frameView)
 {
     ASSERT(isMainThread());
     ASSERT(m_page);
 
     if (!coordinatesScrollingForFrameView(frameView))
         return;
 
     notifyGeometryChanged();
-    updateHaveWheelEventHandlers();
     updateHaveScrollEventHandlers();
 }
 
 #if OS(MACOSX)
 void ScrollingCoordinator::handleWheelEventPhase(PlatformWheelEventPhase phase)
 {
     ASSERT(isMainThread());
 
     if (!m_page)
         return;
@@ skipping 108 matching lines @@
     bool frameIsScrollable = frameView && frameView->isScrollable();
     if (frameIsScrollable != m_wasFrameScrollable)
         return true;
 
     if (WebLayer* scrollLayer = frameView ? toWebLayer(frameView->layerForScrolling()) : nullptr)
         return WebSize(frameView->contentsSize()) != scrollLayer->bounds();
     return false;
 }
 
 } // namespace blink