RoundOff scrollableArea scrollHeight.

third_party/WebKit/Source/core/layout/LayoutBox.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. 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
@@ skipping 437 matching lines @@
 }
 
 int LayoutBox::pixelSnappedScrollWidth() const
 {
     return snapSizeToPixel(scrollWidth(), location().x() + clientLeft());
 }
 
 int LayoutBox::pixelSnappedScrollHeight() const
 {
     if (hasOverflowClip())
-        return layer()->scrollableArea()->scrollHeight();
+        return snapSizeToPixel(layer()->scrollableArea()->scrollHeight(), location().y() + clientTop());
     // For objects with visible overflow, this matches IE.
     // FIXME: Need to work right with writing modes.
     return snapSizeToPixel(scrollHeight(), location().y() + clientTop());
 }
 
 void LayoutBox::setScrollLeft(LayoutUnit newLeft)
 {
     // This doesn't hit in any tests, but since the equivalent code in setScrollTop
     // does, presumably this code does as well.
     DisableCompositingQueryAsserts disabler;
@@ skipping 4365 matching lines @@
     StyleImage* borderImage = style()->borderImage().image();
     return borderImage && borderImage->canRender(*this, style()->effectiveZoom()) && borderImage->isLoaded();
 }
 
 ShapeOutsideInfo* LayoutBox::shapeOutsideInfo() const
 {
     return ShapeOutsideInfo::isEnabledFor(*this) ? ShapeOutsideInfo::info(*this) : nullptr;
 }
 
 } // namespace blink