Allow sites to enable 'window.onerror' handlers for cross-domain scripts.

Source/core/dom/ScriptLoader.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, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * 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
@@ skipping 317 matching lines @@
         executingDocument->addConsoleMessage(SecurityMessageSource, ErrorMessageLevel, "Refused to execute script from '" + m_cachedScript->url().elidedString() + "' because its MIME type ('" + m_cachedScript->mimeType() + "') is not executable, and strict MIME type checking is enabled.");
         return;
     }
 
     if (frame) {
         IgnoreDestructiveWriteCountIncrementer ignoreDesctructiveWriteCountIncrementer(m_isExternalScript ? executingDocument.get() : 0);
 
         if (isHTMLScriptLoader(m_element))
             executingDocument->pushCurrentScript(toHTMLScriptElement(m_element));
 
+        AccessControlStatus corsCheck = NotSharableCrossOrigin;
+        if (sourceCode.cachedScript() && sourceCode.cachedScript()->passesAccessControlCheck(m_element->document()->securityOrigin()))
+            corsCheck = SharableCrossOrigin;
+
         // Create a script from the script element node, using the script
         // block's source and the script block's type.
         // Note: This is where the script is compiled and actually executed.
-        frame->script()->executeScriptInMainWorld(sourceCode);
+        frame->script()->executeScriptInMainWorld(sourceCode, corsCheck);
 
         if (isHTMLScriptLoader(m_element)) {
             ASSERT(executingDocument->currentScript() == m_element);
             executingDocument->popCurrentScript();
         }
     }
 }
 
 void ScriptLoader::stopLoadRequest()
 {
@@ skipping 87 matching lines @@
     if (isHTMLScriptLoader(element))
         return toHTMLScriptElement(element)->loader();
 
     if (isSVGScriptLoader(element))
         return toSVGScriptElement(element)->loader();
 
     return 0;
 }
 
 }