Make PointerEvent coordinates fractional for touch

third_party/WebKit/Source/core/events/MouseRelatedEvent.cpp

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 89 matching lines @@
   m_layerLocation = m_pageLocation;
   m_offsetLocation = m_pageLocation;
 
   computePageLocation();
   m_hasCachedRelativePosition = false;
 }
 
 MouseRelatedEvent::MouseRelatedEvent(const AtomicString& eventType,
                                      const MouseEventInit& initializer)
     : UIEventWithKeyState(eventType, initializer),
-      m_screenLocation(IntPoint(initializer.screenX(), initializer.screenY())),
+      m_screenLocation(LayoutPoint(
+          FloatPoint(initializer.screenX(), initializer.screenY()))),
       m_movementDelta(
           IntPoint(initializer.movementX(), initializer.movementY())),
       m_positionType(PositionType::Position) {
-  initCoordinates(IntPoint(initializer.clientX(), initializer.clientY()));
+  initCoordinates(initializer.clientX(), initializer.clientY());
 }
 
-void MouseRelatedEvent::initCoordinates(const LayoutPoint& clientLocation) {
+void MouseRelatedEvent::initCoordinates(const double clientX,
+                                        const double clientY) {
   // Set up initial values for coordinates.
   // Correct values are computed lazily, see computeRelativePosition.
-  m_clientLocation = clientLocation;
-  m_pageLocation = clientLocation + contentsScrollOffset(view());
+  m_clientLocation = LayoutPoint(FloatPoint(clientX, clientY));
+  m_pageLocation = m_clientLocation + contentsScrollOffset(view());
 
   m_layerLocation = m_pageLocation;
   m_offsetLocation = m_pageLocation;
 
   computePageLocation();
   m_hasCachedRelativePosition = false;
 }
 
 static float pageZoomFactor(const UIEvent* event) {
   if (!event->view() || !event->view()->isLocalDOMWindow())
@@ skipping 127 matching lines @@
   // See Microsoft documentation and
   // <http://www.quirksmode.org/dom/w3c_events.html>.
   return m_clientLocation.y().toInt();
 }
 
 DEFINE_TRACE(MouseRelatedEvent) {
   UIEventWithKeyState::trace(visitor);
 }
 
 }  // namespace blink