Handle nested position:sticky elements

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc.
  *               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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 1210 matching lines @@
       !containerBox->mapScrollingContentsRectToBoxSpace(rect, visualRectFlags))
     return false;
 
   // TODO(wkorman): Generalize Ruby specialization and/or document more clearly.
   if (containerBox && !isRuby())
     containerBox->flipForWritingMode(rect);
   return container->mapToVisualRectInAncestorSpace(ancestor, rect,
                                                    visualRectFlags);
 }
 
-LayoutSize LayoutInline::offsetFromContainer(
-    const LayoutObject* container) const {
+LayoutSize LayoutInline::offsetFromContainer(const LayoutObject* container,
+                                             bool ignoreSticky) const {
   ASSERT(container == this->container());
 
   LayoutSize offset;
   if (isInFlowPositioned())
-    offset += offsetForInFlowPosition();
+    offset += offsetForInFlowPosition(ignoreSticky);
 
   if (container->hasOverflowClip())
     offset -= toLayoutBox(container)->scrolledContentOffset();
 
   return offset;
 }
 
 PaintLayerType LayoutInline::layerTypeRequired() const {
   return isInFlowPositioned() || createsGroup() || hasClipPath() ||
                  style()->shouldCompositeForCurrentAnimations() ||
@@ skipping 270 matching lines @@
     paintInvalidator.invalidateDisplayItemClient(*box, invalidationReason);
 }
 
 // TODO(lunalu): Not to just dump 0, 0 as the x and y here
 LayoutRect LayoutInline::debugRect() const {
   IntRect linesBox = enclosingIntRect(linesBoundingBox());
   return LayoutRect(IntRect(0, 0, linesBox.width(), linesBox.height()));
 }
 
 }  // namespace blink