Chrome requires WebTouchPoint to store WebFloatPoint, instead of WebPoint.

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 "ui/events/keycodes/keyboard_codes.h"
 
 namespace content {
@@ skipping 134 matching lines @@
       continue;
 
     touches[point] = touches[i];
     touches[point].state = WebTouchPoint::StateStationary;
     ++point;
   }
   touchesLength = point;
   type = WebInputEvent::Undefined;
 }
 
-int SyntheticWebTouchEvent::PressPoint(int x, int y) {
+int SyntheticWebTouchEvent::PressPoint(float x, float y) {
   if (touchesLength == touchesLengthCap)
     return -1;
   WebTouchPoint& point = touches[touchesLength];
   point.id = touchesLength;
   point.position.x = point.screenPosition.x = x;
   point.position.y = point.screenPosition.y = y;
   point.state = WebTouchPoint::StatePressed;
   point.radiusX = point.radiusY = 1.f;
   ++touchesLength;
   type = WebInputEvent::TouchStart;
   return point.id;
 }
 
-void SyntheticWebTouchEvent::MovePoint(int index, int x, int y) {
+void SyntheticWebTouchEvent::MovePoint(int index, float x, float y) {
   CHECK(index >= 0 && index < touchesLengthCap);
   WebTouchPoint& point = touches[index];
   point.position.x = point.screenPosition.x = x;
   point.position.y = point.screenPosition.y = y;
   touches[index].state = WebTouchPoint::StateMoved;
   type = WebInputEvent::TouchMove;
 }
 
 void SyntheticWebTouchEvent::ReleasePoint(int index) {
   CHECK(index >= 0 && index < touchesLengthCap);
@@ skipping 13 matching lines @@
 
 SyntheticWebTouchEvent SyntheticWebTouchEventBuilder::Build(
     WebInputEvent::Type type) {
   DCHECK(WebInputEvent::isTouchEventType(type));
   SyntheticWebTouchEvent result;
   result.type = type;
   return result;
 };
 
 }  // namespace content