Merge 139470

Source/WebCore/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 1894 matching lines @@
         HashSet<Document*>::iterator it = documentsThatNeedStyleRecalc->begin();
         Document* doc = *it;
         documentsThatNeedStyleRecalc->remove(doc);
         doc->updateStyleIfNeeded();
     }
 }
 
 void Document::updateLayout()
 {
     ASSERT(isMainThread());
+
+    FrameView* frameView = view();
+    if (frameView && frameView->isInLayout()) {
+        // View layout should not be re-entrant.
+        ASSERT_NOT_REACHED();
+        return;
+    }
+
     if (Element* oe = ownerElement())
         oe->document()->updateLayout();
 
     updateStyleIfNeeded();
 
     StackStats::LayoutCheckPoint layoutCheckPoint;
+
     // Only do a layout if changes have occurred that make it necessary.      
-    FrameView* v = view();
-    if (v && renderer() && (v->layoutPending() || renderer()->needsLayout()))
-        v->layout();
+    if (frameView && renderer() && (frameView->layoutPending() || renderer()->needsLayout()))
+        frameView->layout();
 }
 
 // FIXME: This is a bad idea and needs to be removed eventually.
 // Other browsers load stylesheets before they continue parsing the web page.
 // Since we don't, we can run JavaScript code that needs answers before the
 // stylesheets are loaded. Doing a layout ignoring the pending stylesheets
 // lets us get reasonable answers. The long term solution to this problem is
 // to instead suspend JavaScript execution.
 void Document::updateLayoutIgnorePendingStylesheets()
 {
@@ skipping 4048 matching lines @@
             m_templateContentsOwnerDocument = HTMLDocument::create(0, blankURL());
         else
             m_templateContentsOwnerDocument = Document::create(0, blankURL());
     }
 
     return m_templateContentsOwnerDocument.get();
 }
 #endif
 
 } // namespace WebCore