CachedMetadata support for ServiceWorker script.

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 81 matching lines @@
     // WorkerGlobalScope
     WorkerGlobalScope* self() { return this; }
     WorkerConsole* console();
     WorkerLocation* location() const;
     void close();
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(error);
 
     // WorkerUtils
     virtual void importScripts(const Vector<String>& urls, ExceptionState&);
+    virtual void setCachedMetadata(const KURL&, const char* data, size_t size) { }
+    virtual void clearCachedMetadata(const KURL&) { }
     WorkerNavigator* navigator() const;
 
     // ExecutionContextClient
     virtual WorkerEventQueue* eventQueue() const override final;
     virtual SecurityContext& securityContext() override final { return *this; }
 
     virtual bool isContextThread() const override final;
     virtual bool isJSExecutionForbidden() const override final;
 
     virtual double timerAlignmentInterval() const override final;
@@ skipping 67 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