Improve positioned/percentHeight descendant/container tracking

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 996 matching lines @@
     // If a child is moving from a block-flow to an inline-flow parent then any floats currently intruding into
     // the child can no longer do so. This can happen if a block becomes floating or out-of-flow and is moved
     // to an anonymous block. Remove all floats from their float-lists immediately as markAllDescendantsWithFloatsForLayout
     // won't attempt to remove floats from parents that have inline-flow if we try later.
     if (child->isLayoutBlockFlow() && toBoxModelObject->childrenInline() && !childrenInline()) {
         toLayoutBlockFlow(child)->removeFloatingObjectsFromDescendants();
         ASSERT(!toLayoutBlockFlow(child)->containsFloats());
     }
 
     if (fullRemoveInsert && isLayoutBlock() && child->isBox())
-        LayoutBlock::removePercentHeightDescendantIfNeeded(toLayoutBox(child));
+        toLayoutBox(child)->removeFromPercentHeightContainer();
 
     if (fullRemoveInsert && (toBoxModelObject->isLayoutBlock() || toBoxModelObject->isLayoutInline())) {
         // Takes care of adding the new child correctly if toBlock and fromBlock
         // have different kind of children (block vs inline).
         toBoxModelObject->addChild(virtualChildren()->removeChildNode(this, child), beforeChild);
     } else {
         toBoxModelObject->virtualChildren()->insertChildNode(toBoxModelObject, virtualChildren()->removeChildNode(this, child, fullRemoveInsert), beforeChild, fullRemoveInsert);
     }
 }
 
 void LayoutBoxModelObject::moveChildrenTo(LayoutBoxModelObject* toBoxModelObject, LayoutObject* startChild, LayoutObject* endChild, LayoutObject* beforeChild, bool fullRemoveInsert)
 {
     // This condition is rarely hit since this function is usually called on
     // anonymous blocks which can no longer carry positioned objects (see r120761)
     // or when fullRemoveInsert is false.
     if (fullRemoveInsert && isLayoutBlock()) {
         LayoutBlock* block = toLayoutBlock(this);
         block->removePositionedObjects(nullptr);
-        LayoutBlock::removePercentHeightDescendantIfNeeded(block);
+        block->removeFromPercentHeightContainer();
         if (block->isLayoutBlockFlow())
             toLayoutBlockFlow(block)->removeFloatingObjects();
     }
 
     ASSERT(!beforeChild || toBoxModelObject == beforeChild->parent());
     for (LayoutObject* child = startChild; child && child != endChild; ) {
         // Save our next sibling as moveChildTo will clear it.
         LayoutObject* nextSibling = child->nextSibling();
         moveChildTo(toBoxModelObject, child, beforeChild, fullRemoveInsert);
         child = nextSibling;
@@ skipping 17 matching lines @@
     if (rootElementStyle->hasBackground())
         return false;
 
     if (node() != document().firstBodyElement())
         return false;
 
     return true;
 }
 
 } // namespace blink