Use float for scroll offset.

third_party/WebKit/Source/core/input/PointerEventManager.cpp

 // Copyright 2016 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 "core/input/PointerEventManager.h"
 
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/shadow/FlatTreeTraversal.h"
 #include "core/events/MouseEvent.h"
 #include "core/frame/FrameView.h"
@@ skipping 327 matching lines @@
       touchInfo.targetFrame = touchInfo.touchNode->document().frame();
     }
 
     // Do not send pointer events for stationary touches or null targetFrame
     if (touchInfo.touchNode && touchInfo.targetFrame &&
         touchPoint.state() != PlatformTouchPoint::TouchStationary &&
         !m_inCanceledStateForPointerTypeTouch) {
       FloatPoint pagePoint = touchInfo.targetFrame->view()->rootFrameToContents(
           touchInfo.point.pos());
       float scaleFactor = 1.0f / touchInfo.targetFrame->pageZoomFactor();
-      FloatPoint scrollPosition =
-          touchInfo.targetFrame->view()->scrollPosition();
+      FloatPoint scrollPosition(touchInfo.targetFrame->view()->scrollOffset());
       FloatPoint framePoint = pagePoint.scaledBy(scaleFactor);
       framePoint.moveBy(scrollPosition.scaledBy(-scaleFactor));
       PointerEvent* pointerEvent = m_pointerEventFactory.create(
           pointerEventNameForTouchPointState(touchPoint.state()), touchPoint,
           event.getModifiers(), touchPoint.radius().scaledBy(scaleFactor),
           framePoint,
           touchInfo.touchNode ? touchInfo.touchNode->document().domWindow()
                               : nullptr);
 
       WebInputEventResult result =
@@ skipping 333 matching lines @@
 DEFINE_TRACE(PointerEventManager) {
   visitor->trace(m_frame);
   visitor->trace(m_nodeUnderPointer);
   visitor->trace(m_pointerCaptureTarget);
   visitor->trace(m_pendingPointerCaptureTarget);
   visitor->trace(m_touchEventManager);
   visitor->trace(m_mouseEventManager);
 }
 
 }  // namespace blink