Handle nested position:sticky elements

third_party/WebKit/Source/core/layout/LayoutObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1231 matching lines @@
   TransformationMatrix localToAncestorTransform(
       const LayoutBoxModelObject* ancestor,
       MapCoordinatesFlags = 0) const;
   TransformationMatrix localToAbsoluteTransform(
       MapCoordinatesFlags mode = 0) const {
     return localToAncestorTransform(nullptr, mode);
   }
 
   // Return the offset from the container() layoutObject (excluding transforms
   // and multicol).
-  virtual LayoutSize offsetFromContainer(const LayoutObject*) const;
+  virtual LayoutSize offsetFromContainer(const LayoutObject*,
+                                         bool ignoreSticky = false) const;
   // Return the offset from an object up the container() chain. Asserts that
   // none of the intermediate objects have transforms.
   LayoutSize offsetFromAncestorContainer(const LayoutObject*) const;
 
   virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint&) const {}
 
   FloatRect absoluteBoundingBoxFloatRect() const;
   // This returns an IntRect enclosing this object. If this object has an
   // integral size and the position has fractional values, the resultant
   // IntRect can be larger than the integral size.
@@ skipping 1451 matching lines @@
 CORE_EXPORT void showLineTree(const blink::LayoutObject*);
 CORE_EXPORT void showLayoutTree(const blink::LayoutObject* object1);
 // We don't make object2 an optional parameter so that showLayoutTree
 // can be called from gdb easily.
 CORE_EXPORT void showLayoutTree(const blink::LayoutObject* object1,
                                 const blink::LayoutObject* object2);
 
 #endif
 
 #endif  // LayoutObject_h