Wheel scroll latching enabled behind flag.

ui/events/blink/input_handler_proxy.cc

Index: ui/events/blink/input_handler_proxy.cc
diff --git a/ui/events/blink/input_handler_proxy.cc b/ui/events/blink/input_handler_proxy.cc
index 821a38625a91a6bd85f23fb2bc89304939bdebc0..e128193c8c02e86acd7db610d989350e41461a23 100644
--- a/ui/events/blink/input_handler_proxy.cc
+++ b/ui/events/blink/input_handler_proxy.cc
@@ -131,6 +131,10 @@ cc::ScrollState CreateScrollStateForGesture(const WebGestureEvent& event) {
       scroll_state_data.position_x = event.x;
       scroll_state_data.position_y = event.y;
       scroll_state_data.is_beginning = true;
+      // In Mac flings are also scrolls.
+      if (event.data.scrollBegin.inertialPhase ==

[dtapuska, 2016/07/19 17:41:31]

Is this going to work for devices that don't have momentum phase on mac?

[sahel, 2016/07/19 22:47:03]

I think yes, because there is no fling for devices that don't have the momentum
phase. The condition will be always false for such devices and the
is_inertial_phase won't become true.

+          WebGestureEvent::MomentumPhase)
+        scroll_state_data.is_in_inertial_phase = true;
       break;
     case WebInputEvent::GestureFlingStart:
       scroll_state_data.velocity_x = event.data.flingStart.velocityX;