Use float for scroll offset.

third_party/WebKit/Source/core/paint/FramePainter.cpp

 // Copyright 2014 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/paint/FramePainter.h"
 
 #include "core/editing/markers/DocumentMarkerController.h"
 #include "core/fetch/MemoryCache.h"
 #include "core/frame/FrameView.h"
 #include "core/inspector/InspectorInstrumentation.h"
@@ skipping 56 matching lines @@
     TransformRecorder transformRecorder(
         context, *frameView().layoutView(),
         AffineTransform::translation(frameView().x() - frameView().scrollX(),
                                      frameView().y() - frameView().scrollY()));
 
     ClipRecorder recorder(context, *frameView().layoutView(),
                           DisplayItem::kClipFrameToVisibleContentRect,
                           frameView().visibleContentRect());
 
     documentDirtyRect.moveBy(-frameView().location() +
-                             frameView().scrollPosition());
+                             frameView().scrollOffsetInt());
     paintContents(context, globalPaintFlags, documentDirtyRect);
   }
 
   if (shouldPaintScrollbars) {
     IntRect scrollViewDirtyRect = rect.m_rect;
     IntRect visibleAreaWithScrollbars(
         frameView().location(),
         frameView().visibleContentRect(IncludeScrollbars).size());
     scrollViewDirtyRect.intersect(visibleAreaWithScrollbars);
     scrollViewDirtyRect.moveBy(-frameView().location());
@@ skipping 148 matching lines @@
 
   bar.paint(context, CullRect(rect));
 }
 
 const FrameView& FramePainter::frameView() {
   ASSERT(m_frameView);
   return *m_frameView;
 }
 
 }  // namespace blink