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..72f51972005175c266f869254168c96496c1aff6 100644
--- a/Source/core/dom/ScriptLoader.h
+++ b/Source/core/dom/ScriptLoader.h
@@ -50,6 +50,12 @@ 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();
@@ -65,6 +71,7 @@ public:
     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();
@@ -98,6 +105,7 @@ private:
     bool m_willExecuteWhenDocumentFinishedParsing : 1;
     bool m_forceAsync : 1;
     bool m_willExecuteInOrder : 1;
+    bool m_isPotentiallyCORSEnabled : 1;
     String m_characterEncoding;
     String m_fallbackCharacterEncoding;
 };