Fully update compositing information for *layerTreeAsText calls

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 407 matching lines @@
 
     for (RenderObject* o = root; o; o = o->nextInPreOrder(root)) {
         ++totalObjects;
         if (o->needsLayout())
             ++needsLayoutObjects;
     }
 }
 
 String LocalFrame::layerTreeAsText(unsigned flags) const
 {
-    document()->updateLayout();
-
     if (!contentRenderer())
         return String();
 
+    ASSERT(document()->lifecycle().state() >= DocumentLifecycle::CompositingClean);
+
     return contentRenderer()->compositor()->layerTreeAsText(static_cast<LayerTreeFlags>(flags));
 }
 
 String LocalFrame::trackedRepaintRectsAsText() const
 {
     if (!m_view)
         return String();
     return m_view->trackedRepaintRectsAsText();
 }
 
@@ skipping 189 matching lines @@
 {
     if (!m_host)
         return 0;
 
     double ratio = m_host->deviceScaleFactor();
     ratio *= pageZoomFactor();
     return ratio;
 }
 
 } // namespace WebCore