Postpone rail application for touch scrolling - chrome side.

ui/events/blink/blink_event_util.cc

Index: ui/events/blink/blink_event_util.cc
diff --git a/ui/events/blink/blink_event_util.cc b/ui/events/blink/blink_event_util.cc
index 835a82b243640998d7c35ad7a64114c2800d440c..25b4dc1876c2315269b9f4bc4d5d8f72c142a8b0 100644
--- a/ui/events/blink/blink_event_util.cc
+++ b/ui/events/blink/blink_event_util.cc
@@ -125,6 +125,21 @@ WebTouchPoint CreateWebTouchPoint(const MotionEvent& event,
   return touch;
 }
 
+WebGestureEvent::RailsMode ToRailsMode(
+    GestureEventDetails::ScrollRailState scroll_rail_state) {
+  switch(scroll_rail_state) {
+    case GestureEventDetails::ScrollRailState::Horizontal:
+        return WebGestureEvent::RailsModeHorizontal;
+    case GestureEventDetails::ScrollRailState::Vertical:
+        return WebGestureEvent::RailsModeVertical;
+    case GestureEventDetails::ScrollRailState::Free:
+        return WebGestureEvent::RailsModeFree;
+    default:
+      NOTREACHED() << "Invalid rail mode";
+      return WebGestureEvent::RailsModeFree;
+  }
+}
+
 }  // namespace
 
 blink::WebTouchEvent CreateWebTouchEventFromMotionEvent(
@@ -249,6 +264,8 @@ WebGestureEvent CreateWebGestureEvent(const GestureEventDetails& details,
       gesture.data.scrollUpdate.deltaY = details.scroll_y();
       gesture.data.scrollUpdate.previousUpdateInSequencePrevented =
           details.previous_scroll_update_in_sequence_prevented();
+      gesture.data.scrollUpdate.railsMode =
+          ToRailsMode(details.scroll_rail_state());
       break;
     case ET_GESTURE_SCROLL_END:
       gesture.type = WebInputEvent::GestureScrollEnd;
@@ -257,6 +274,8 @@ WebGestureEvent CreateWebGestureEvent(const GestureEventDetails& details,
       gesture.type = WebInputEvent::GestureFlingStart;
       gesture.data.flingStart.velocityX = details.velocity_x();
       gesture.data.flingStart.velocityY = details.velocity_y();
+      gesture.data.flingStart.railsMode =
+          ToRailsMode(details.scroll_rail_state());
       break;
     case ET_SCROLL_FLING_CANCEL:
       gesture.type = WebInputEvent::GestureFlingCancel;