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

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 248 matching lines @@
         if (frame) {
             ScriptStreamer::startStreaming(m_pendingScript, frame->settings(), ScriptState::forMainWorld(frame));
         }
         contextDocument->scriptRunner()->queueScriptForExecution(this, ScriptRunner::ASYNC_EXECUTION);
         // Note that watchForLoad can immediately call notifyFinished.
         m_pendingScript.watchForLoad(this);
     } else {
         // Reset line numbering for nested writes.
         TextPosition position = elementDocument.isInDocumentWrite() ? TextPosition() : scriptStartPosition;
         KURL scriptURL = (!elementDocument.isInDocumentWrite() && m_parserInserted) ? elementDocument.url() : KURL();
-        if (!executeScript(ScriptSourceCode(scriptContent(), scriptURL, position)))
+        if (!executeScript(ScriptSourceCode(scriptContent(), scriptURL, position))) {
+            dispatchErrorEvent();
             return false;
+        }
     }
 
     return true;
 }
 
 bool ScriptLoader::fetchScript(const String& sourceUrl, FetchRequest::DeferOption defer)
 {
     ASSERT(m_element);
 
     RefPtrWillBeRawPtr<Document> elementDocument(m_element->document());
@@ skipping 49 matching lines @@
     if (!contextDocument)
         return true;
 
     LocalFrame* frame = contextDocument->frame();
 
     const ContentSecurityPolicy* csp = elementDocument->contentSecurityPolicy();
     bool shouldBypassMainWorldCSP = (frame && frame->script().shouldBypassMainWorldCSP())
         || csp->allowScriptWithNonce(m_element->fastGetAttribute(HTMLNames::nonceAttr))
         || csp->allowScriptWithHash(sourceCode.source());
 
-    if (!m_isExternalScript && (!shouldBypassMainWorldCSP && !csp->allowInlineScript(elementDocument->url(), m_startLineNumber, sourceCode.source())))
-        return true;
+    if (!m_isExternalScript && (!shouldBypassMainWorldCSP && !csp->allowInlineScript(elementDocument->url(), m_startLineNumber, sourceCode.source()))) {
+        return false;
+    }
 
     if (m_isExternalScript) {
         ScriptResource* resource = m_resource ? m_resource.get() : sourceCode.resource();
         if (resource && !resource->mimeTypeAllowedByNosniff()) {
             contextDocument->addConsoleMessage(ConsoleMessage::create(SecurityMessageSource, ErrorMessageLevel, "Refused to execute script from '" + resource->url().elidedString() + "' because its MIME type ('" + resource->mimeType() + "') is not executable, and strict MIME type checking is enabled."));
-            return true;
+            return false;
         }
 
         if (resource && resource->mimeType().lower().startsWith("image/")) {
             contextDocument->addConsoleMessage(ConsoleMessage::create(SecurityMessageSource, ErrorMessageLevel, "Refused to execute script from '" + resource->url().elidedString() + "' because its MIME type ('" + resource->mimeType() + "') is not executable."));
             UseCounter::count(frame, UseCounter::BlockedSniffingImageToScript);
-            return true;
+            return false;
         }
     }
 
     // FIXME: Can this be moved earlier in the function?
     // Why are we ever attempting to execute scripts without a frame?
     if (!frame)
         return true;
 
     AccessControlStatus corsCheck = NotSharableCrossOrigin;
     if (!m_isExternalScript || (sourceCode.resource() && sourceCode.resource()->passesAccessControlCheck(m_element->document().securityOrigin())))
@@ skipping 119 matching lines @@
     if (isHTMLScriptLoader(element))
         return toHTMLScriptElement(element)->loader();
 
     if (isSVGScriptLoader(element))
         return toSVGScriptElement(element)->loader();
 
     return 0;
 }
 
 } // namespace blink