Fire error events for a variety of script and style failures.

Source/core/dom/StyleElement.h

 /*
  * Copyright (C) 2006, 2007 Rob Buis
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 19 matching lines @@
 class Document;
 class Element;
 
 class StyleElement : public WillBeGarbageCollectedMixin {
 public:
     StyleElement(Document*, bool createdByParser);
     virtual ~StyleElement();
     DECLARE_VIRTUAL_TRACE();
 
 protected:
+    enum ProcessingResult {
+        ProcessingSuccessful,
+        ProcessingFatalError
+    };
+
     virtual const AtomicString& type() const = 0;
     virtual const AtomicString& media() const = 0;
 
     CSSStyleSheet* sheet() const { return m_sheet.get(); }
 
     bool isLoading() const;
     bool sheetLoaded(Document&);
     void startLoadingDynamicSheet(Document&);
 
     void insertedInto(Element*, ContainerNode* insertionPoint);
     void removedFrom(Element*, ContainerNode* insertionPoint);
-    void processStyleSheet(Document&, Element*);
     void clearDocumentData(Document&, Element*);
-    void childrenChanged(Element*);
-    void finishParsingChildren(Element*);
+    ProcessingResult processStyleSheet(Document&, Element*);
+    ProcessingResult childrenChanged(Element*);
+    ProcessingResult finishParsingChildren(Element*);
 
     RefPtrWillBeMember<CSSStyleSheet> m_sheet;
 
 private:
-    void createSheet(Element*, const String& text = String());
-    void process(Element*);
+    ProcessingResult createSheet(Element*, const String& text = String());
+    ProcessingResult process(Element*);
     void clearSheet(Element* ownerElement = 0);
 
     bool m_createdByParser : 1;
     bool m_loading : 1;
     bool m_registeredAsCandidate : 1;
     TextPosition m_startPosition;
 };
 
 }
 
 #endif