Plumb firing passive event listeners.

ui/events/blink/input_handler_proxy.h

Index: ui/events/blink/input_handler_proxy.h
diff --git a/ui/events/blink/input_handler_proxy.h b/ui/events/blink/input_handler_proxy.h
index e96b31bf40b918d39423a66de100a173a98a902a..4564e8e649434c59de7fb1b8f70eb676ab7c6cf4 100644
--- a/ui/events/blink/input_handler_proxy.h
+++ b/ui/events/blink/input_handler_proxy.h
@@ -46,10 +46,12 @@ class InputHandlerProxy
   }
 
   void set_smooth_scroll_enabled(bool value) { smooth_scroll_enabled_ = value; }
+  void set_scroll_on_mouse_wheel(bool value) { scroll_on_mouse_wheel_ = value; }
 
   enum EventDisposition {
     DID_HANDLE,
     DID_NOT_HANDLE,
+    NON_BLOCKING,
     DROP_EVENT
   };
   EventDisposition HandleInputEventWithLatencyInfo(
@@ -99,8 +101,8 @@ class InputHandlerProxy
       const blink::WebGestureEvent& event);
   EventDisposition HandleGestureFlingStart(
       const blink::WebGestureEvent& event);
-  EventDisposition HandleTouchStart(
-      const blink::WebTouchEvent& event);
+  EventDisposition HandleTouchStart(const blink::WebTouchEvent& event);
+  EventDisposition HandleTouchMove(const blink::WebTouchEvent& event);
 
   // Returns true if the event should be suppressed due to to an active,
   // boost-enabled fling, in which case further processing should cease.
@@ -187,6 +189,8 @@ class InputHandlerProxy
 
   bool uma_latency_reporting_enabled_;
 
+  bool scroll_on_mouse_wheel_;

[tdresser, 2016/01/26 16:34:37]

I'm not a big fan of the naming here, and I'm not quite sure what this does.

[dtapuska, 2016/01/26 16:53:15]

I didn't care for the name either. Effective it means don't execute the old code
path because --enable-wheel-gestures is on.

[tdresser, 2016/01/26 18:45:42]

Something like "wheel_gestures_enabled_"?

+
   base::TimeTicks last_fling_animate_time_;
 
   DISALLOW_COPY_AND_ASSIGN(InputHandlerProxy);