CachedMetadata support for ServiceWorker script.

Source/modules/modules.gypi

 {
   'includes': [
     '../core/core_generated.gypi',
     'modules_generated.gypi',
   ],
   'variables': {
     # Experimental hooks for embedder to provide extra IDL and source files.
     #
     # Note: this is not a supported API. If you rely on this, you will be broken
     # from time to time as the code generator changes in backward incompatible
@@ skipping 951 matching lines @@
       'serviceworkers/ServiceWorkerWindowClient.cpp',
       'serviceworkers/ServiceWorkerWindowClient.h',
       'serviceworkers/ServiceWorkerError.cpp',
       'serviceworkers/ServiceWorkerError.h',
       'serviceworkers/ServiceWorkerGlobalScope.cpp',
       'serviceworkers/ServiceWorkerGlobalScope.h',
       'serviceworkers/ServiceWorkerGlobalScopeClient.cpp',
       'serviceworkers/ServiceWorkerGlobalScopeClient.h',
       'serviceworkers/ServiceWorkerRegistration.cpp',
       'serviceworkers/ServiceWorkerRegistration.h',
+      'serviceworkers/ServiceWorkerScriptCachedMetadataHandler.cpp',
+      'serviceworkers/ServiceWorkerScriptCachedMetadataHandler.h',
       'serviceworkers/ServiceWorkerThread.cpp',
       'serviceworkers/ServiceWorkerThread.h',
       'serviceworkers/WaitUntilObserver.cpp',
       'speech/DOMWindowSpeechSynthesis.cpp',
       'speech/DOMWindowSpeechSynthesis.h',
       'speech/SpeechGrammar.cpp',
       'speech/SpeechGrammar.h',
       'speech/SpeechGrammarList.cpp',
       'speech/SpeechGrammarList.h',
       'speech/SpeechRecognition.cpp',
@@ skipping 252 matching lines @@
       'indexeddb/IDBKeyPathTest.cpp',
       'indexeddb/IDBRequestTest.cpp',
       'indexeddb/IDBTransactionTest.cpp',
       'serviceworkers/CacheTest.cpp',
       'serviceworkers/ServiceWorkerContainerTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }