Tie scroll anchoring adjustments to frame lifecycle instead of layout.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc.
  * All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
@@ skipping 757 matching lines @@
 
   if (LayoutBox* layoutObject = layoutBox())
     return adjustLayoutUnitForAbsoluteZoom(
                LayoutUnit(layoutObject->pixelSnappedClientHeight()),
                layoutObject->styleRef())
         .round();
   return 0;
 }
 
 double Element::scrollLeft() {
-  document().updateStyleAndLayoutIgnorePendingStylesheetsForNode(this);
+  document().updateScrollPosition(this);
 
   if (document().scrollingElement() == this) {
     if (document().domWindow())
       return document().domWindow()->scrollX();
     return 0;
   }
 
   if (LayoutBox* box = layoutBox())
     return adjustScrollForAbsoluteZoom(box->scrollLeft(), *box);
 
   return 0;
 }
 
 double Element::scrollTop() {
-  document().updateStyleAndLayoutIgnorePendingStylesheetsForNode(this);
+  document().updateScrollPosition(this);
 
   if (document().scrollingElement() == this) {
     if (document().domWindow())
       return document().domWindow()->scrollY();
     return 0;
   }
 
   if (LayoutBox* box = layoutBox())
     return adjustScrollForAbsoluteZoom(box->scrollTop(), *box);
 
@@ skipping 3278 matching lines @@
 }
 
 DEFINE_TRACE_WRAPPERS(Element) {
   if (hasRareData()) {
     visitor->traceWrappers(elementRareData());
   }
   ContainerNode::traceWrappers(visitor);
 }
 
 }  // namespace blink