Tap suppression controller forwards the next TapCancel when the stashed TapDown is forwarded.

content/browser/renderer_host/input/touchscreen_tap_suppression_controller.cc

 // Copyright 2013 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 "content/browser/renderer_host/input/touchscreen_tap_suppression_controller.h"
 
 #include <utility>
 
 #include "content/browser/renderer_host/input/gesture_event_queue.h"
 
@@ skipping 15 matching lines @@
 
 void TouchscreenTapSuppressionController::GestureFlingCancelAck(
     bool processed) {
   controller_.GestureFlingCancelAck(processed);
 }
 
 bool TouchscreenTapSuppressionController::FilterTapEvent(
     const GestureEventWithLatencyInfo& event) {
   switch (event.event.type) {
     case WebInputEvent::GestureTapDown:
+      forward_next_tap_cancel_ = false;
       if (!controller_.ShouldDeferTapDown())
         return false;
       stashed_tap_down_.reset(new GestureEventWithLatencyInfo(event));
       return true;
 
     case WebInputEvent::GestureShowPress:
       if (!stashed_tap_down_)
         return false;
       stashed_show_press_.reset(new GestureEventWithLatencyInfo(event));
       return true;
 
     case WebInputEvent::GestureLongPress:
       // It is possible that a GestureLongPress arrives after tapDownTimer
       // expiration, in this case it should still get filtered if the
       // controller suppresses the tap end events.
       if (!stashed_tap_down_)
         return controller_.ShouldSuppressTapEnd();
 
       stashed_long_press_.reset(new GestureEventWithLatencyInfo(event));
       return true;
 
     case WebInputEvent::GestureTapUnconfirmed:
       return !!stashed_tap_down_;
 
     case WebInputEvent::GestureTapCancel:
+      return !forward_next_tap_cancel_ && controller_.ShouldSuppressTapEnd();
+
     case WebInputEvent::GestureTap:
     case WebInputEvent::GestureDoubleTap:
     case WebInputEvent::GestureLongTap:
     case WebInputEvent::GestureTwoFingerTap:
       return controller_.ShouldSuppressTapEnd();
 
     default:
       break;
   }
   return false;
@@ skipping 16 matching lines @@
   if (long_press)
     gesture_event_queue_->ForwardGestureEvent(*long_press);
 }
 
 void TouchscreenTapSuppressionController::ForwardStashedTapDown() {
   DCHECK(stashed_tap_down_);
   ScopedGestureEvent tap_down = std::move(stashed_tap_down_);
   gesture_event_queue_->ForwardGestureEvent(*tap_down);
   stashed_show_press_.reset();
   stashed_long_press_.reset();
+  forward_next_tap_cancel_ = true;
 }
 
 }  // namespace content