Consuming a touch move prevents only the next scroll update.

ui/events/gestures/gesture_sequence.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/events/gestures/gesture_sequence.h"
 
 #include <stdlib.h>
 #include <cmath>
 #include <limits>
 
@@ skipping 120 matching lines @@
 
   GST_SYNTHETIC_CLICK_ABORTED_FIRST_RELEASED =
       G(GS_SYNTHETIC_CLICK_ABORTED, 0, TS_RELEASED, TSI_ALWAYS),
 
   GST_SYNTHETIC_CLICK_ABORTED_SECOND_PRESSED =
       G(GS_SYNTHETIC_CLICK_ABORTED, 1, TS_PRESSED, TSI_NOT_PROCESSED),
 
   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),
 
   GST_SCROLL_SECOND_PRESSED =
       G(GS_SCROLL, 1, TS_PRESSED, TSI_NOT_PROCESSED),
 
   GST_PENDING_TWO_FINGER_TAP_FIRST_RELEASED =
       G(GS_PENDING_TWO_FINGER_TAP, 0, TS_RELEASED, TSI_NOT_PROCESSED),
 
@@ skipping 191 matching lines @@
     case GST_PENDING_SYNTHETIC_CLICK_NO_SCROLL_FIRST_RELEASED:
     case GST_PENDING_SYNTHETIC_CLICK_NO_SCROLL_FIRST_RELEASED_HANDLED:
     case GST_PENDING_SYNTHETIC_CLICK_NO_SCROLL_FIRST_MOVED:
     case GST_PENDING_SYNTHETIC_CLICK_NO_SCROLL_FIRST_STATIONARY:
     case GST_PENDING_SYNTHETIC_CLICK_NO_SCROLL_FIRST_CANCELLED:
     case GST_PENDING_SYNTHETIC_CLICK_NO_SCROLL_SECOND_PRESSED:
     case GST_SYNTHETIC_CLICK_ABORTED_FIRST_RELEASED:
     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:
     case GST_PENDING_TWO_FINGER_TAP_FIRST_RELEASED_HANDLED:
     case GST_PENDING_TWO_FINGER_TAP_SECOND_RELEASED:
     case GST_PENDING_TWO_FINGER_TAP_SECOND_RELEASED_HANDLED:
     case GST_PENDING_TWO_FINGER_TAP_FIRST_MOVED:
     case GST_PENDING_TWO_FINGER_TAP_SECOND_MOVED:
     case GST_PENDING_TWO_FINGER_TAP_FIRST_MOVED_HANDLED:
     case GST_PENDING_TWO_FINGER_TAP_SECOND_MOVED_HANDLED:
@@ skipping 236 matching lines @@
     case GST_SYNTHETIC_CLICK_ABORTED_FIRST_RELEASED:
       set_state(GS_NO_GESTURE);
       break;
     case GST_SCROLL_FIRST_MOVED:
       if (scroll_type_ == ST_VERTICAL ||
           scroll_type_ == ST_HORIZONTAL)
         BreakRailScroll(event, point, gestures.get());
       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());
       set_state(GS_NO_GESTURE);
       break;
     case GST_PENDING_SYNTHETIC_CLICK_SECOND_PRESSED:
     case GST_PENDING_SYNTHETIC_CLICK_NO_SCROLL_SECOND_PRESSED:
       PrependTapCancelGestureEvent(point, gestures.get());
       TwoFingerTapOrPinch(event, point, gestures.get());
       break;
@@ skipping 847 matching lines @@
 
   // Since a timer is running, there should be a non-NULL point.
   const GesturePoint* point = GetPointByPointId(0);
   if (!point->IsInsideTouchSlopRegion(event)) {
     GetLongPressTimer()->Stop();
     GetShowPressTimer()->Stop();
   }
 }
 
 }  // namespace ui