Block execution of failed 'crossorigin' <script>s.

Source/core/dom/ScriptLoader.h

 /*
  * Copyright (C) 2008 Nikolas Zimmermann <zimmermann@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
  * 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 32 matching lines @@
     Element* element() const { return m_element; }
 
     enum LegacyTypeSupport { DisallowLegacyTypeInTypeAttribute, AllowLegacyTypeInTypeAttribute };
     bool prepareScript(const TextPosition& scriptStartPosition = TextPosition::minimumPosition(), LegacyTypeSupport = DisallowLegacyTypeInTypeAttribute);
 
     String scriptCharset() const { return m_characterEncoding; }
     String scriptContent() const;
     void executeScript(const ScriptSourceCode&);
     void execute(ScriptResource*);
 
+    // Check if potentially cross-origin enabled script is accessible
+    // prior to execution. Returns 'false' if not accessible, signalling
+    // that callers must not dispatch load events as the cross-origin
+    // fetch failed.
+    bool executePotentiallyCrossOriginScript(const ScriptSourceCode&);
+
     // XML parser calls these
     void dispatchLoadEvent();
     void dispatchErrorEvent();
     bool isScriptTypeSupported(LegacyTypeSupport) const;
 
     bool haveFiredLoadEvent() const { return m_haveFiredLoad; }
     bool willBeParserExecuted() const { return m_willBeParserExecuted; }
     bool readyToBeParserExecuted() const { return m_readyToBeParserExecuted; }
     bool willExecuteWhenDocumentFinishedParsing() const { return m_willExecuteWhenDocumentFinishedParsing; }
     ResourcePtr<ScriptResource> resource() { return m_resource; }
 
     void setHaveFiredLoadEvent(bool haveFiredLoad) { m_haveFiredLoad = haveFiredLoad; }
     bool isParserInserted() const { return m_parserInserted; }
     bool alreadyStarted() const { return m_alreadyStarted; }
     bool forceAsync() const { return m_forceAsync; }
+    bool isPotentiallyCORSEnabled() const { return m_isPotentiallyCORSEnabled; }
 
     // Helper functions used by our parent classes.
     void didNotifySubtreeInsertionsToDocument();
     void childrenChanged();
     void handleSourceAttribute(const String& sourceUrl);
     void handleAsyncAttribute();
 
 private:
     ScriptLoader(Element*, bool createdByParser, bool isEvaluated);
 
@@ skipping 13 matching lines @@
     WTF::OrdinalNumber m_startLineNumber;
     bool m_parserInserted : 1;
     bool m_isExternalScript : 1;
     bool m_alreadyStarted : 1;
     bool m_haveFiredLoad : 1;
     bool m_willBeParserExecuted : 1; // Same as "The parser will handle executing the script."
     bool m_readyToBeParserExecuted : 1;
     bool m_willExecuteWhenDocumentFinishedParsing : 1;
     bool m_forceAsync : 1;
     bool m_willExecuteInOrder : 1;
+    bool m_isPotentiallyCORSEnabled : 1;
     String m_characterEncoding;
     String m_fallbackCharacterEncoding;
 };
 
 ScriptLoader* toScriptLoaderIfPossible(Element*);
 
 inline PassOwnPtr<ScriptLoader> ScriptLoader::create(Element* element, bool createdByParser, bool isEvaluated)
 {
     return adoptPtr(new ScriptLoader(element, createdByParser, isEvaluated));
 }
 
 }
 
 
 #endif