Use float for scroll offset.

third_party/WebKit/Source/core/dom/Touch.cpp

 /*
  * Copyright 2008, The Android Open Source Project
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *  * Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  * Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 20 matching lines @@
 
 namespace blink {
 
 static FloatPoint contentsOffset(LocalFrame* frame) {
   if (!frame)
     return FloatPoint();
   FrameView* frameView = frame->view();
   if (!frameView)
     return FloatPoint();
   float scale = 1.0f / frame->pageZoomFactor();
-  return FloatPoint(frameView->scrollPosition()).scaledBy(scale);
+  return FloatPoint(frameView->scrollOffset()).scaledBy(scale);
 }
 
 Touch::Touch(LocalFrame* frame,
              EventTarget* target,
              int identifier,
              const FloatPoint& screenPos,
              const FloatPoint& pagePos,
              const FloatSize& radius,
              float rotationAngle,
              float force,
@@ skipping 50 matching lines @@
   return new Touch(eventTarget, m_identifier, m_clientPos, m_screenPos,
                    m_pagePos, m_radius, m_rotationAngle, m_force, m_region,
                    m_absoluteLocation);
 }
 
 DEFINE_TRACE(Touch) {
   visitor->trace(m_target);
 }
 
 }  // namespace blink