Basic experimental suborigin CSP directive and SecurityOrigin mods

Source/core/workers/WorkerGlobalScope.h

 /*
  * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 93 matching lines @@
     virtual PassOwnPtr<CachedMetadataHandler> createWorkerScriptCachedMetadataHandler(const KURL& scriptURL, const Vector<char>* metaData) { return nullptr; }
 
     WorkerNavigator* navigator() const;
 
     // ScriptWrappable
     v8::Local<v8::Object> wrap(v8::Isolate*, v8::Local<v8::Object> creationContext) override final;
     v8::Local<v8::Object> associateWithWrapper(v8::Isolate*, const WrapperTypeInfo*, v8::Local<v8::Object> wrapper) override final;
 
     // ExecutionContextClient
     WorkerEventQueue* eventQueue() const override final;
-    const SecurityContext& securityContext() const override final { return *this; }
+    SecurityContext& securityContext() override final { return *this; }
 
     bool isContextThread() const override final;
     bool isJSExecutionForbidden() const override final;
 
     double timerAlignmentInterval() const override final;
     DOMTimerCoordinator* timers() override final;
 
     WorkerInspectorController* workerInspectorController() { return m_workerInspectorController.get(); }
 
     bool isClosing() { return m_closing; }
@@ skipping 73 matching lines @@
 
     unsigned long m_workerExceptionUniqueIdentifier;
     WillBeHeapHashMap<unsigned long, RefPtrWillBeMember<ConsoleMessage>> m_pendingMessages;
 };
 
 DEFINE_TYPE_CASTS(WorkerGlobalScope, ExecutionContext, context, context->isWorkerGlobalScope(), context.isWorkerGlobalScope());
 
 } // namespace blink
 
 #endif // WorkerGlobalScope_h