Guard Element and getComputedStyle methods that force a layout with inActiveDocument.

third_party/WebKit/Source/core/dom/Document.h

 /*
  * 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, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 417 matching lines @@
     // Same as updateLayoutTree() except ignoring pending stylesheets.
     void updateLayoutTreeIgnorePendingStylesheets();
     void updateLayoutTreeForNode(Node*);
     void updateLayout();
     void layoutUpdated();
     enum RunPostLayoutTasks {
         RunPostLayoutTasksAsyhnchronously,
         RunPostLayoutTasksSynchronously,
     };
     void updateLayoutIgnorePendingStylesheets(RunPostLayoutTasks = RunPostLayoutTasksAsyhnchronously);
+    void updateLayoutIgnorePendingStylesheetsForNode(Node*);
     PassRefPtr<ComputedStyle> styleForElementIgnoringPendingStylesheets(Element*);
     PassRefPtr<ComputedStyle> styleForPage(int pageIndex);
 
     // Returns true if page box (margin boxes and page borders) is visible.
     bool isPageBoxVisible(int pageIndex);
 
     // Returns the preferred page size and margins in pixels, assuming 96
     // pixels per inch. pageSize, marginTop, marginRight, marginBottom,
     // marginLeft must be initialized to the default values that are used if
     // auto is specified.
@@ skipping 999 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLiveDocumentInstances();
 #endif
 
 #endif // Document_h