Fix ScrollAnchor descent into absolute-positioned containers.

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

 // Copyright 2015 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.
 
 #ifndef ScrollAnchor_h
 #define ScrollAnchor_h
 
 #include "core/CoreExport.h"
 #include "platform/geometry/LayoutPoint.h"
 #include "platform/heap/Handle.h"
@@ skipping 50 matching lines @@
   // Checks if we hold any references to the specified object.
   bool refersTo(const LayoutObject*) const;
 
   // Notifies us that an object will be removed from the layout tree.
   void notifyRemoved(LayoutObject*);
 
   DEFINE_INLINE_TRACE() { visitor->trace(m_scroller); }
 
  private:
   void findAnchor();
+  // Returns true if searching should stop. Stores result in m_anchorObject.
+  bool findAnchorRecursive(LayoutObject*);
   bool computeScrollAnchorDisablingStyleChanged();
 
   enum WalkStatus { Skip = 0, Constrain, Continue, Return };
   struct ExamineResult {
     ExamineResult(WalkStatus s)
         : status(s), viable(false), corner(Corner::TopLeft) {}
 
     ExamineResult(WalkStatus s, Corner c)
         : status(s), viable(true), corner(c) {}
 
@@ skipping 28 matching lines @@
   bool m_scrollAnchorDisablingStyleChanged;
 
   // True iff an adjustment check has been queued with the FrameView but not yet
   // performed.
   bool m_queued;
 };
 
 }  // namespace blink
 
 #endif  // ScrollAnchor_h