Introduce LayoutObject::AncestorSkipInfo.

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

 // 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.
 
 #include "core/layout/ScrollAnchor.h"
 
 #include "core/frame/FrameView.h"
 #include "core/frame/UseCounter.h"
 #include "core/layout/LayoutBlockFlow.h"
 #include "core/layout/api/LayoutBoxItem.h"
@@ skipping 101 matching lines @@
   return cornerPointOfRect(relativeBounds(layoutObject, scroller), corner);
 }
 
 static bool candidateMayMoveWithScroller(const LayoutObject* candidate,
                                          const ScrollableArea* scroller) {
   if (const ComputedStyle* style = candidate->style()) {
     if (style->hasViewportConstrainedPosition())
       return false;
   }
 
-  bool skippedByContainerLookup = false;
-  candidate->container(scrollerLayoutBox(scroller), &skippedByContainerLookup);
-  return !skippedByContainerLookup;
+  LayoutObject::AncestorSkipInfo skipInfo(scrollerLayoutBox(scroller));
+  candidate->container(&skipInfo);
+  return !skipInfo.ancestorSkipped();
 }
 
 ScrollAnchor::ExamineResult ScrollAnchor::examine(
     const LayoutObject* candidate) const {
   if (candidate->isLayoutInline())
     return ExamineResult(Continue);
 
   // Anonymous blocks are not in the DOM tree and it may be hard for
   // developers to reason about the anchor node.
   if (candidate->isAnonymous())
@@ skipping 195 matching lines @@
 bool ScrollAnchor::refersTo(const LayoutObject* layoutObject) const {
   return m_anchorObject == layoutObject;
 }
 
 void ScrollAnchor::notifyRemoved(LayoutObject* layoutObject) {
   if (m_anchorObject == layoutObject)
     clearSelf();
 }
 
 }  // namespace blink