Make sure that the pressure is always 0 for pointerup events

content/common/input/synthetic_web_input_event_builders.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/common/input/synthetic_web_input_event_builders.h"
 
 #include "base/logging.h"
 #include "content/common/input/web_touch_event_traits.h"
 #include "ui/events/base_event_utils.h"
 #include "ui/events/keycodes/keyboard_codes.h"
@@ skipping 210 matching lines @@
   point.position.y = point.screenPosition.y = y;
   touches[index].state = WebTouchPoint::StateMoved;
   WebTouchEventTraits::ResetType(WebInputEvent::TouchMove, timeStampSeconds(),
                                  this);
 }
 
 void SyntheticWebTouchEvent::ReleasePoint(int index) {
   CHECK_GE(index, 0);
   CHECK_LT(index, kTouchesLengthCap);
   touches[index].state = WebTouchPoint::StateReleased;
+  touches[index].force = 0.f;
   WebTouchEventTraits::ResetType(WebInputEvent::TouchEnd, timeStampSeconds(),
                                  this);
 }
 
 void SyntheticWebTouchEvent::CancelPoint(int index) {
   CHECK_GE(index, 0);
   CHECK_LT(index, kTouchesLengthCap);
   touches[index].state = WebTouchPoint::StateCancelled;
   WebTouchEventTraits::ResetType(WebInputEvent::TouchCancel, timeStampSeconds(),
                                  this);
 }
 
 void SyntheticWebTouchEvent::SetTimestamp(base::TimeTicks timestamp) {
   setTimeStampSeconds(ui::EventTimeStampToSeconds(timestamp));
 }
 
 int SyntheticWebTouchEvent::FirstFreeIndex() {
   for (size_t i = 0; i < kTouchesLengthCap; ++i) {
     if (touches[i].state == WebTouchPoint::StateUndefined)
       return i;
   }
   return -1;
 }
 
 }  // namespace content