Introduce LayoutObject::AncestorSkipInfo.

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

Index: third_party/WebKit/Source/core/layout/ScrollAnchor.cpp
diff --git a/third_party/WebKit/Source/core/layout/ScrollAnchor.cpp b/third_party/WebKit/Source/core/layout/ScrollAnchor.cpp
index fdd8e69a9b504b23314bf356dc0de41d88653353..ea3ea54877fd0cc0bf98dab992d3364c78aef898 100644
--- a/third_party/WebKit/Source/core/layout/ScrollAnchor.cpp
+++ b/third_party/WebKit/Source/core/layout/ScrollAnchor.cpp
@@ -119,9 +119,9 @@ static bool candidateMayMoveWithScroller(const LayoutObject* candidate,
       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(