Track whether a scroll sequence has been partially prevented

ui/events/gesture_detection/touch_disposition_gesture_filter.cc

Index: ui/events/gesture_detection/touch_disposition_gesture_filter.cc
diff --git a/ui/events/gesture_detection/touch_disposition_gesture_filter.cc b/ui/events/gesture_detection/touch_disposition_gesture_filter.cc
index fcb92d495d4bca53df5016a50209ccfe95328076..55b5e8b83761157dcc1bfda16e2ce7c81fe9c942 100644
--- a/ui/events/gesture_detection/touch_disposition_gesture_filter.cc
+++ b/ui/events/gesture_detection/touch_disposition_gesture_filter.cc
@@ -314,6 +314,10 @@ void TouchDispositionGestureFilter::SendGesture(
       ending_event_primary_tool_type_ = event.primary_tool_type;
       needs_scroll_ending_event_ = true;
       break;
+    case ET_GESTURE_SCROLL_UPDATE:
+      if (state_.HasFilteredGestureType(ET_GESTURE_SCROLL_UPDATE))
+        event.details.mark_previous_scroll_update_in_sequence_prevented();
+      break;
     case ET_GESTURE_SCROLL_END:
       needs_scroll_ending_event_ = false;
       break;
@@ -418,10 +422,17 @@ bool TouchDispositionGestureFilter::GestureHandlingState::Filter(
        last_gesture_of_type_dropped_.has_bit(
            GetGestureTypeIndex(antecedent_event_type)))) {
     last_gesture_of_type_dropped_.mark_bit(GetGestureTypeIndex(gesture_type));
+    any_gesture_of_type_dropped_.mark_bit(GetGestureTypeIndex(gesture_type));
     return true;
   }
   last_gesture_of_type_dropped_.clear_bit(GetGestureTypeIndex(gesture_type));
   return false;
 }
 
+bool TouchDispositionGestureFilter::GestureHandlingState::
+    HasFilteredGestureType(EventType gesture_type) const {
+  return any_gesture_of_type_dropped_.has_bit(
+      GetGestureTypeIndex(gesture_type));
+}
+
 }  // namespace content