Communicate whether passive event listeners exist to cc.

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 774 matching lines @@
         if (subFrame->isLocalFrame())
             shouldHandleScrollGestureOnMainThreadRegion.unite(computeShouldHandleScrollGestureOnMainThreadRegion(toLocalFrame(subFrame), offset));
     }
 
     return shouldHandleScrollGestureOnMainThreadRegion;
 }
 
 static void accumulateDocumentTouchEventTargetRects(LayerHitTestRects& rects, const Document* document)
 {
     ASSERT(document);
-    const EventTargetSet* targets = document->frameHost()->eventHandlerRegistry().eventHandlerTargets(EventHandlerRegistry::TouchEvent);
+    const EventTargetSet* targets = document->frameHost()->eventHandlerRegistry().eventHandlerTargets(EventHandlerRegistry::TouchEventBlocking);
     if (!targets)
         return;
 
     // If there's a handler on the window, document, html or body element (fairly common in practice),
     // then we can quickly mark the entire document and skip looking at any other handlers.
     // Note that technically a handler on the body doesn't cover the whole document, but it's
     // reasonable to be conservative and report the whole document anyway.
     //
     // Fullscreen HTML5 video when OverlayFullscreenVideo is enabled is implemented by replacing the
     // root cc::layer with the video layer so doing this optimization causes the compositor to think
@@ skipping 245 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