Keep track of multiple layout roots

Source/core/frame/LocalFrame.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 436 matching lines @@
     Document* doc = document();
     if (!doc)
         return false;
     // FIXME: This check is broken in for OOPI.
     HTMLFrameOwnerElement* owner = doc->ownerElement();
     if (!owner)
         return false;
     return owner->treeScope() == scope;
 }
 
-void LocalFrame::countObjectsNeedingLayout(unsigned& needsLayoutObjects, unsigned& totalObjects, bool& isPartial)
-{
-    LayoutObject* root = view()->layoutRoot();
-    isPartial = true;
-    if (!root) {
-        isPartial = false;
-        root = contentRenderer();
-    }
-
-    needsLayoutObjects = 0;
-    totalObjects = 0;
-
-    for (LayoutObject* o = root; o; o = o->nextInPreOrder(root)) {
-        ++totalObjects;
-        if (o->needsLayout())
-            ++needsLayoutObjects;
-    }
-}
-
 String LocalFrame::layerTreeAsText(LayerTreeFlags flags) const
 {
     TextStream textStream;
     textStream << localLayerTreeAsText(flags);
 
     for (Frame* child = tree().firstChild(); child; child = child->tree().traverseNext(this)) {
         if (!child->isLocalFrame())
             continue;
         String childLayerTree = toLocalFrame(child)->localLayerTreeAsText(flags);
         if (!childLayerTree.length())
@@ skipping 357 matching lines @@
     // We detach the FrameView's custom scroll bars as early as
     // possible to prevent m_doc->detach() from messing with the view
     // such that its scroll bars won't be torn down.
     //
     // FIXME: We should revisit this.
     if (m_view)
         m_view->prepareForDetach();
 }
 
 } // namespace blink