Add touch scrolling modes experimental flags (DEPRECATED)

ui/events/gestures/gesture_sequence.cc

Index: ui/events/gestures/gesture_sequence.cc
diff --git a/ui/events/gestures/gesture_sequence.cc b/ui/events/gestures/gesture_sequence.cc
index 95e48d9b2cf302a8f05478fd500875557b810b21..ba373373c5c75a768612b4759d45f22b44c8d9fe 100644
--- a/ui/events/gestures/gesture_sequence.cc
+++ b/ui/events/gestures/gesture_sequence.cc
@@ -138,9 +138,11 @@ enum EdgeStateSignatureType {
   GST_SCROLL_FIRST_RELEASED =
       G(GS_SCROLL, 0, TS_RELEASED, TSI_ALWAYS),
 
-  // Once scroll has started, process all touch-move events.
   GST_SCROLL_FIRST_MOVED =
-      G(GS_SCROLL, 0, TS_MOVED, TSI_ALWAYS),
+      G(GS_SCROLL, 0, TS_MOVED, TSI_NOT_PROCESSED),
+
+  GST_SCROLL_FIRST_MOVED_HANDLED =
+      G(GS_SCROLL, 0, TS_MOVED, TSI_PROCESSED),
 
   GST_SCROLL_FIRST_CANCELLED =
       G(GS_SCROLL, 0, TS_CANCELLED, TSI_ALWAYS),
@@ -352,6 +354,7 @@ EdgeStateSignatureType Signature(GestureState gesture_state,
     case GST_SYNTHETIC_CLICK_ABORTED_SECOND_PRESSED:
     case GST_SCROLL_FIRST_RELEASED:
     case GST_SCROLL_FIRST_MOVED:
+    case GST_SCROLL_FIRST_MOVED_HANDLED:
     case GST_SCROLL_FIRST_CANCELLED:
     case GST_SCROLL_SECOND_PRESSED:
     case GST_PENDING_TWO_FINGER_TAP_FIRST_RELEASED:
@@ -618,6 +621,8 @@ GestureSequence::Gestures* GestureSequence::ProcessTouchEventForGesture(
       if (ScrollUpdate(event, point, gestures.get(), FS_NOT_FIRST_SCROLL))
         point.UpdateForScroll();
       break;
+    case GST_SCROLL_FIRST_MOVED_HANDLED:
+      break;
     case GST_SCROLL_FIRST_RELEASED:
     case GST_SCROLL_FIRST_CANCELLED:
       ScrollEnd(event, point, gestures.get());