Communicate whether passive event listeners exist to cc.

third_party/WebKit/Source/core/inspector/InspectorLayerTreeAgent.cpp

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 194 matching lines @@
 PassRefPtr<TypeBuilder::Array<TypeBuilder::LayerTree::Layer> > InspectorLayerTreeAgent::buildLayerTree()
 {
     PaintLayerCompositor* compositor = paintLayerCompositor();
     if (!compositor || !compositor->inCompositingMode())
         return nullptr;
 
     LayerIdToNodeIdMap layerIdToNodeIdMap;
     RefPtr<TypeBuilder::Array<TypeBuilder::LayerTree::Layer> > layers = TypeBuilder::Array<TypeBuilder::LayerTree::Layer>::create();
     buildLayerIdToNodeIdMap(compositor->rootLayer(), layerIdToNodeIdMap);
     int scrollingLayerId = m_inspectedFrames->root()->view()->layerForScrolling()->platformLayer()->id();
-    bool haveWheelEventHandlers = m_inspectedFrames->root()->chromeClient().haveWheelEventHandlers();
+    bool haveBlockingWheelEventHandlers = m_inspectedFrames->root()->chromeClient().eventListenerProperties(WebEventListenerClass::MouseWheel) == WebEventListenerProperties::Blocking;
 
-    gatherGraphicsLayers(rootGraphicsLayer(), layerIdToNodeIdMap, layers, haveWheelEventHandlers, scrollingLayerId);
+    gatherGraphicsLayers(rootGraphicsLayer(), layerIdToNodeIdMap, layers, haveBlockingWheelEventHandlers, scrollingLayerId);
     return layers.release();
 }
 
 void InspectorLayerTreeAgent::buildLayerIdToNodeIdMap(PaintLayer* root, LayerIdToNodeIdMap& layerIdToNodeIdMap)
 {
     if (root->hasCompositedLayerMapping()) {
         if (Node* node = root->layoutObject()->generatingNode()) {
             GraphicsLayer* graphicsLayer = root->compositedLayerMapping()->childForSuperlayers();
             layerIdToNodeIdMap.set(graphicsLayer->platformLayer()->id(), idForNode(node));
         }
@@ skipping 239 matching lines @@
 void InspectorLayerTreeAgent::didRemovePageOverlay(const GraphicsLayer* layer)
 {
     size_t index = m_pageOverlayLayerIds.find(layer->platformLayer()->id());
     if (index == WTF::kNotFound)
         return;
     m_pageOverlayLayerIds.remove(index);
 }
 
 
 } // namespace blink