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

Source/core/dom/ScriptLoader.h

Index: Source/core/dom/ScriptLoader.h
diff --git a/Source/core/dom/ScriptLoader.h b/Source/core/dom/ScriptLoader.h
index e6ba8d3b080a8381caf99d256b575fdc4c62a3a3..012fcd7b290d7fe7273c13c1e2c2627f2af59ed4 100644
--- a/Source/core/dom/ScriptLoader.h
+++ b/Source/core/dom/ScriptLoader.h
@@ -30,6 +30,7 @@ namespace WebCore {
 
 class ScriptResource;
 class ContainerNode;
+class Document;
 class Element;
 class ScriptLoaderClient;
 class ScriptSourceCode;
@@ -50,6 +51,12 @@ public:
     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();
@@ -72,6 +79,8 @@ public:
     void handleSourceAttribute(const String& sourceUrl);
     void handleAsyncAttribute();
 
+    static void reportCrossOriginFailure(Document*, const KURL& originUrl, const String& errorDescription);
+
 private:
     ScriptLoader(Element*, bool createdByParser, bool isEvaluated);