Communicate whether passive event listeners exist to cc.

ui/events/blink/input_handler_proxy.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/events/blink/input_handler_proxy.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 270 matching lines @@
           static_cast<const WebGestureEvent&>(event));
 
     case WebInputEvent::GestureScrollEnd:
       return HandleGestureScrollEnd(static_cast<const WebGestureEvent&>(event));
 
     case WebInputEvent::GesturePinchBegin: {
       DCHECK(!gesture_pinch_on_impl_thread_);
       const WebGestureEvent& gesture_event =
           static_cast<const WebGestureEvent&>(event);
       if (gesture_event.sourceDevice == blink::WebGestureDeviceTouchpad &&
-          input_handler_->HaveWheelEventHandlers()) {
+          input_handler_->GetEventListenerProperties(
+              cc::EventListenerClass::kMouseWheel) !=
+              cc::EventListenerProperties::kNone) {
         return DID_NOT_HANDLE;
       } else {
         input_handler_->PinchGestureBegin();
         gesture_pinch_on_impl_thread_ = true;
         return DID_HANDLE;
       }
     }
 
     case WebInputEvent::GesturePinchEnd:
       if (gesture_pinch_on_impl_thread_) {
@@ skipping 867 matching lines @@
   // trigger a scroll, e.g., with a trivial time delta between fling updates.
   // Return true in this case to prevent early fling termination.
   if (std::abs(clipped_increment.width) < kScrollEpsilon &&
       std::abs(clipped_increment.height) < kScrollEpsilon)
     return true;
 
   return did_scroll;
 }
 
 }  // namespace ui