Communicate whether passive event listeners exist to cc.

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 10 matching lines @@
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebLayerTreeView_h
 #define WebLayerTreeView_h
 
 #include "WebColor.h"
 #include "WebCommon.h"
+#include "WebEventListenerProperties.h"
 #include "WebFloatPoint.h"
 #include "WebNonCopyable.h"
 #include "WebPrivateOwnPtr.h"
 #include "WebSize.h"
 #include "WebTopControlsState.h"
 
 class SkBitmap;
 
 namespace blink {
 
@@ skipping 94 matching lines @@
         const WebLayer* pageScaleLayer,
         const WebLayer* innerViewportScrollLayer,
         const WebLayer* outerViewportScrollLayer) { }
     virtual void clearViewportLayers() { }
 
     // Used to update the active selection bounds.
     virtual void registerSelection(const WebSelection&) { }
     virtual void clearSelection() { }
 
     // Input properties ---------------------------------------------------
-    virtual void setHaveWheelEventHandlers(bool) { };
+    virtual void setEventListenerProperties(WebEventListenerClass, WebEventListenerProperties) { };
     virtual void setHaveScrollEventHandlers(bool) { };
 
     // Debugging / dangerous ---------------------------------------------
 
-    virtual bool haveWheelEventHandlers() const { return false; };
+    virtual WebEventListenerProperties eventListenerProperties(WebEventListenerClass) const { return WebEventListenerProperties::Nothing; };
     virtual bool haveScrollEventHandlers() const { return false; };
 
     virtual int layerTreeId() const { return 0; }
 
     // Toggles the FPS counter in the HUD layer
     virtual void setShowFPSCounter(bool) { }
 
     // Toggles the paint rects in the HUD layer
     virtual void setShowPaintRects(bool) { }
 
     // 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