Postpone rail application for touch scrolling - chrome side.

ui/events/gesture_detection/snap_scroll_controller.cc

Index: ui/events/gesture_detection/snap_scroll_controller.cc
diff --git a/ui/events/gesture_detection/snap_scroll_controller.cc b/ui/events/gesture_detection/snap_scroll_controller.cc
index 9ecf6b108c8a71030bc282bda1dbc1c5f065696a..827c32738c28ae85c406a210b8675faf935eede5 100644
--- a/ui/events/gesture_detection/snap_scroll_controller.cc
+++ b/ui/events/gesture_detection/snap_scroll_controller.cc
@@ -91,7 +91,7 @@ void SnapScrollController::SetSnapScrollMode(
 
 void SnapScrollController::UpdateSnapScrollMode(float distance_x,
                                                 float distance_y) {
-  if (!IsSnappingScrolls())
+  if (mode_ != SNAP_VERT && mode_ != SNAP_HORIZ)
     return;
 
   accumulated_distance_ +=
@@ -110,15 +110,25 @@ void SnapScrollController::UpdateSnapScrollMode(float distance_x,
 }
 
 bool SnapScrollController::IsSnapVertical() const {
-  return mode_ == SNAP_VERT;
+  return ScrollRailState() == GestureEventDetails::ScrollRailState::Vertical;
 }
 
 bool SnapScrollController::IsSnapHorizontal() const {
-  return mode_ == SNAP_HORIZ;
+  return ScrollRailState() == GestureEventDetails::ScrollRailState::Horizontal;
 }
 
 bool SnapScrollController::IsSnappingScrolls() const {
-  return IsSnapHorizontal() || IsSnapVertical();
+  return ScrollRailState() != GestureEventDetails::ScrollRailState::Free;
+}
+
+
+GestureEventDetails::ScrollRailState SnapScrollController::ScrollRailState()
+    const {
+  if (mode_ == SNAP_VERT)
+    return GestureEventDetails::ScrollRailState::Vertical;
+  if (mode_ == SNAP_HORIZ)
+    return GestureEventDetails::ScrollRailState::Horizontal;
+  return GestureEventDetails::ScrollRailState::Free;
 }
 
 }  // namespace ui