Introduce LayoutObject::AncestorSkipInfo.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google 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
@@ skipping 1183 matching lines @@
   return currentStyle.isHorizontalWritingMode()
              ? LayoutRect(x, y, caretWidth(), height)
              : LayoutRect(y, x, height, caretWidth());
 }
 
 const LayoutObject* LayoutBoxModelObject::pushMappingToContainer(
     const LayoutBoxModelObject* ancestorToStopAt,
     LayoutGeometryMap& geometryMap) const {
   ASSERT(ancestorToStopAt != this);
 
-  bool ancestorSkipped;
-  LayoutObject* container = this->container(ancestorToStopAt, &ancestorSkipped);
+  AncestorSkipInfo skipInfo(ancestorToStopAt);
+  LayoutObject* container = this->container(&skipInfo);
   if (!container)
     return nullptr;
 
   bool isInline = isLayoutInline();
   bool isFixedPos = !isInline && style()->position() == FixedPosition;
   bool containsFixedPosition = canContainFixedPositionObjects();
 
   LayoutSize adjustmentForSkippedAncestor;
-  if (ancestorSkipped) {
+  if (skipInfo.ancestorSkipped()) {
     // There can't be a transform between paintInvalidationContainer and
     // ancestorToStopAt, because transforms create containers, so it should be
     // safe to just subtract the delta between the ancestor and
     // ancestorToStopAt.
     adjustmentForSkippedAncestor =
         -ancestorToStopAt->offsetFromAncestorContainer(container);
   }
 
   LayoutSize containerOffset = offsetFromContainer(container);
   bool offsetDependsOnPoint;
@@ skipping 19 matching lines @@
     TransformationMatrix t;
     getTransformFromContainer(container, containerOffset, t);
     t.translateRight(adjustmentForSkippedAncestor.width().toFloat(),
                      adjustmentForSkippedAncestor.height().toFloat());
     geometryMap.push(this, t, flags, LayoutSize());
   } else {
     containerOffset += adjustmentForSkippedAncestor;
     geometryMap.push(this, containerOffset, flags, LayoutSize());
   }
 
-  return ancestorSkipped ? ancestorToStopAt : container;
+  return skipInfo.ancestorSkipped() ? ancestorToStopAt : container;
 }
 
 void LayoutBoxModelObject::moveChildTo(LayoutBoxModelObject* toBoxModelObject,
                                        LayoutObject* child,
                                        LayoutObject* beforeChild,
                                        bool fullRemoveInsert) {
   // We assume that callers have cleared their positioned objects list for child
   // moves (!fullRemoveInsert) so the positioned layoutObject maps don't become
   // stale. It would be too slow to do the map lookup on each call.
   ASSERT(!fullRemoveInsert || !isLayoutBlock() ||
@@ skipping 75 matching lines @@
   if (rootElementStyle->hasBackground())
     return false;
 
   if (node() != document().firstBodyElement())
     return false;
 
   return true;
 }
 
 }  // namespace blink