[import] support document.stylesheets in imported documents.

Source/core/dom/StyleEngine.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 89 matching lines @@
     void addStyleSheetCandidateNode(Node*, bool createdByParser);
     void removeStyleSheetCandidateNode(Node*, ContainerNode* scopingNode = 0);
     void modifiedStyleSheetCandidateNode(Node*);
 
     void invalidateInjectedStyleSheetCache();
     void updateInjectedStyleSheetCache() const;
 
     void addAuthorSheet(PassRefPtr<StyleSheetContents> authorSheet);
 
     void clearMediaQueryRuleSetStyleSheets();
-    void collectDocumentStyleSheets(DocumentStyleSheetCollector&);
+    void updateStyleSheetsInImport(DocumentStyleSheetCollector& parentCollector);
     bool updateActiveStyleSheets(StyleResolverUpdateMode);
 
     String preferredStylesheetSetName() const { return m_preferredStylesheetSetName; }
     String selectedStylesheetSetName() const { return m_selectedStylesheetSetName; }
     void setPreferredStylesheetSetName(const String& name) { m_preferredStylesheetSetName = name; }
     void setSelectedStylesheetSetName(const String& name) { m_selectedStylesheetSetName = name; }
 
     void selectStylesheetSetName(const String& name)
     {
         setPreferredStylesheetSetName(name);
@@ skipping 121 matching lines @@
     unsigned m_lastResolverAccessCount;
     Timer<StyleEngine> m_resolverThrowawayTimer;
     OwnPtr<StyleResolver> m_resolver;
 
     RefPtr<CSSFontSelector> m_fontSelector;
 };
 
 }
 
 #endif