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

Source/core/html/HTMLStyleElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2010 Apple Inc. All rights reserved.
  *           (C) 2007 Rob Buis (buis@kde.org)
  *
  * 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
@@ skipping 59 matching lines @@
     } else if (name == mediaAttr && inDocument() && document().isActive() && m_sheet) {
         m_sheet->setMediaQueries(MediaQuerySet::create(value));
         document().modifiedStyleSheet(m_sheet.get());
     } else {
         HTMLElement::parseAttribute(name, value);
     }
 }
 
 void HTMLStyleElement::finishParsingChildren()
 {
-    StyleElement::finishParsingChildren(this);
+    StyleElement::ProcessingResult result = StyleElement::finishParsingChildren(this);
     HTMLElement::finishParsingChildren();
+    if (result == StyleElement::ProcessingFatalError)
+        notifyLoadedSheetAndAllCriticalSubresources(true);
 }
 
 Node::InsertionNotificationRequest HTMLStyleElement::insertedInto(ContainerNode* insertionPoint)
 {
     HTMLElement::insertedInto(insertionPoint);
     StyleElement::insertedInto(this, insertionPoint);
     return InsertionShouldCallDidNotifySubtreeInsertions;
 }
 
 void HTMLStyleElement::removedFrom(ContainerNode* insertionPoint)
 {
     HTMLElement::removedFrom(insertionPoint);
     StyleElement::removedFrom(this, insertionPoint);
 }
 
 void HTMLStyleElement::didNotifySubtreeInsertionsToDocument()
 {
-    StyleElement::processStyleSheet(document(), this);
+    if (StyleElement::processStyleSheet(document(), this) == StyleElement::ProcessingFatalError)
+        notifyLoadedSheetAndAllCriticalSubresources(true);
 }
 
 void HTMLStyleElement::childrenChanged(const ChildrenChange& change)
 {
     HTMLElement::childrenChanged(change);
-    StyleElement::childrenChanged(this);
+    if (StyleElement::childrenChanged(this) == StyleElement::ProcessingFatalError)
+        notifyLoadedSheetAndAllCriticalSubresources(true);
 }
 
 const AtomicString& HTMLStyleElement::media() const
 {
     return getAttribute(mediaAttr);
 }
 
 const AtomicString& HTMLStyleElement::type() const
 {
     return getAttribute(typeAttr);
@@ skipping 44 matching lines @@
         styleSheet->setDisabled(setDisabled);
 }
 
 DEFINE_TRACE(HTMLStyleElement)
 {
     StyleElement::trace(visitor);
     HTMLElement::trace(visitor);
 }
 
 }