Handle touchpad flings with passive event listeners on compositor thread.

ui/events/blink/input_handler_proxy.h

 // 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.
 
 #ifndef UI_EVENTS_BLINK_INPUT_HANDLER_PROXY_H_
 #define UI_EVENTS_BLINK_INPUT_HANDLER_PROXY_H_
 
 #include <memory>
 
 #include "base/containers/hash_tables.h"
@@ skipping 89 matching lines @@
  protected:
   void RecordMainThreadScrollingReasons(blink::WebGestureDevice device,
                                         uint32_t reasons);
 
  private:
   friend class test::InputHandlerProxyTest;
 
   // Helper functions for handling more complicated input events.
   EventDisposition HandleMouseWheel(
       const blink::WebMouseWheelEvent& event);
-  EventDisposition ScrollByMouseWheel(const blink::WebMouseWheelEvent& event);
+  EventDisposition ScrollByMouseWheel(
+      const blink::WebMouseWheelEvent& event,
+      cc::EventListenerProperties listener_properties);
   EventDisposition HandleGestureScrollBegin(
       const blink::WebGestureEvent& event);
   EventDisposition HandleGestureScrollUpdate(
       const blink::WebGestureEvent& event);
   EventDisposition HandleGestureScrollEnd(
       const blink::WebGestureEvent& event);
   EventDisposition HandleGestureFlingStart(
       const blink::WebGestureEvent& event);
   EventDisposition HandleTouchStart(const blink::WebTouchEvent& event);
   EventDisposition HandleTouchMove(const blink::WebTouchEvent& event);
@@ skipping 103 matching lines @@
   // bundled in the event ack, saving an IPC.  Note that we must continue
   // supporting overscroll IPC notifications due to fling animation updates.
   std::unique_ptr<DidOverscrollParams> current_overscroll_params_;
 
   DISALLOW_COPY_AND_ASSIGN(InputHandlerProxy);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_BLINK_INPUT_HANDLER_PROXY_H_