ServiceWorker: Add initial implementation of ExtendableMessageEvent behind a flag

third_party/WebKit/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 160 matching lines @@
       'quota/StorageErrorCallback.idl',
       'quota/StorageInfo.idl',
       'quota/StorageManager.idl',
       'quota/StorageQuota.idl',
       'quota/StorageQuotaCallback.idl',
       'quota/StorageUsageCallback.idl',
       'screen_orientation/ScreenOrientation.idl',
       'serviceworkers/Client.idl',
       'serviceworkers/Clients.idl',
       'serviceworkers/ExtendableEvent.idl',
+      'serviceworkers/ExtendableMessageEvent.idl',
       'serviceworkers/FetchEvent.idl',
       'serviceworkers/InstallEvent.idl',
       'serviceworkers/ServiceWorker.idl',
       'serviceworkers/ServiceWorkerContainer.idl',
       'serviceworkers/ServiceWorkerGlobalScope.idl',
       'serviceworkers/ServiceWorkerMessageEvent.idl',
       'serviceworkers/ServiceWorkerRegistration.idl',
       'serviceworkers/WindowClient.idl',
       'speech/SpeechGrammar.idl',
       'speech/SpeechGrammarList.idl',
@@ skipping 219 matching lines @@
       'mediastream/MediaStreamEvent.idl',
       'mediastream/MediaStreamTrackEvent.idl',
       'mediastream/RTCDTMFToneChangeEvent.idl',
       'mediastream/RTCDataChannelEvent.idl',
       'mediastream/RTCIceCandidateEvent.idl',
       'navigatorconnect/ServicePortConnectEvent.idl',
       'notifications/NotificationEvent.idl',
       'presentation/PresentationConnectionAvailableEvent.idl',
       'push_messaging/PushEvent.idl',
       'serviceworkers/ExtendableEvent.idl',
+      'serviceworkers/ExtendableMessageEvent.idl',
       'serviceworkers/FetchEvent.idl',
       'serviceworkers/InstallEvent.idl',
       'serviceworkers/ServiceWorkerMessageEvent.idl',
       'speech/SpeechRecognitionError.idl',
       'speech/SpeechRecognitionEvent.idl',
       'speech/SpeechSynthesisEvent.idl',
       'storage/StorageEvent.idl',
       'webaudio/AudioProcessingEvent.idl',
       'webaudio/OfflineAudioCompletionEvent.idl',
       'webgl/WebGLContextEvent.idl',
@@ skipping 59 matching lines @@
       'notifications/NotificationEventInit.idl',
       'notifications/NotificationOptions.idl',
       'permissions/MidiPermissionDescriptor.idl',
       'permissions/PermissionDescriptor.idl',
       'permissions/PushPermissionDescriptor.idl',
       'presentation/PresentationConnectionAvailableEventInit.idl',
       'push_messaging/PushEventInit.idl',
       'push_messaging/PushSubscriptionOptions.idl',
       'serviceworkers/ClientQueryOptions.idl',
       'serviceworkers/ExtendableEventInit.idl',
+      'serviceworkers/ExtendableMessageEventInit.idl',
       'serviceworkers/FetchEventInit.idl',
       'serviceworkers/RegistrationOptions.idl',
       'serviceworkers/ServiceWorkerMessageEventInit.idl',
       'speech/SpeechRecognitionErrorInit.idl',
       'speech/SpeechRecognitionEventInit.idl',
       'storage/StorageEventInit.idl',
       'vr/VRFieldOfViewInit.idl',
       'webgl/WebGLContextAttributes.idl',
       'webgl/WebGLContextEventInit.idl',
       'webmidi/MIDIConnectionEventInit.idl',
@@ skipping 138 matching lines @@
       '<(blink_modules_output_dir)/presentation/PresentationConnectionAvailableEventInit.cpp',
       '<(blink_modules_output_dir)/presentation/PresentationConnectionAvailableEventInit.h',
       '<(blink_modules_output_dir)/push_messaging/PushEventInit.cpp',
       '<(blink_modules_output_dir)/push_messaging/PushEventInit.h',
       '<(blink_modules_output_dir)/push_messaging/PushSubscriptionOptions.cpp',
       '<(blink_modules_output_dir)/push_messaging/PushSubscriptionOptions.h',
       '<(blink_modules_output_dir)/serviceworkers/ClientQueryOptions.cpp',
       '<(blink_modules_output_dir)/serviceworkers/ClientQueryOptions.h',
       '<(blink_modules_output_dir)/serviceworkers/ExtendableEventInit.cpp',
       '<(blink_modules_output_dir)/serviceworkers/ExtendableEventInit.h',
+      '<(blink_modules_output_dir)/serviceworkers/ExtendableMessageEventInit.cpp',
+      '<(blink_modules_output_dir)/serviceworkers/ExtendableMessageEventInit.h',
       '<(blink_modules_output_dir)/serviceworkers/FetchEventInit.cpp',
       '<(blink_modules_output_dir)/serviceworkers/FetchEventInit.h',
       '<(blink_modules_output_dir)/serviceworkers/RegistrationOptions.cpp',
       '<(blink_modules_output_dir)/serviceworkers/RegistrationOptions.h',
       '<(blink_modules_output_dir)/serviceworkers/ServiceWorkerMessageEventInit.cpp',
       '<(blink_modules_output_dir)/serviceworkers/ServiceWorkerMessageEventInit.h',
       '<(blink_modules_output_dir)/speech/SpeechRecognitionErrorInit.cpp',
       '<(blink_modules_output_dir)/speech/SpeechRecognitionErrorInit.h',
       '<(blink_modules_output_dir)/speech/SpeechRecognitionEventInit.cpp',
       '<(blink_modules_output_dir)/speech/SpeechRecognitionEventInit.h',
@@ skipping 717 matching lines @@
       'screen_orientation/ScreenOrientation.cpp',
       'screen_orientation/ScreenOrientation.h',
       'screen_orientation/ScreenOrientationController.cpp',
       'screen_orientation/ScreenOrientationController.h',
       'screen_orientation/ScreenOrientationDispatcher.cpp',
       'screen_orientation/ScreenOrientationDispatcher.h',
       'screen_orientation/ScreenOrientationInspectorAgent.cpp',
       'screen_orientation/ScreenOrientationInspectorAgent.h',
       'serviceworkers/ExtendableEvent.cpp',
       'serviceworkers/ExtendableEvent.h',
+      'serviceworkers/ExtendableMessageEvent.cpp',
+      'serviceworkers/ExtendableMessageEvent.h',
       'serviceworkers/FetchEvent.cpp',
       'serviceworkers/FetchEvent.h',
       'serviceworkers/InstallEvent.cpp',
       'serviceworkers/InstallEvent.h',
       'serviceworkers/NavigatorServiceWorker.cpp',
       'serviceworkers/NavigatorServiceWorker.h',
       'serviceworkers/RespondWithObserver.cpp',
       'serviceworkers/RespondWithObserver.h',
       'serviceworkers/ServiceWorker.cpp',
       'serviceworkers/ServiceWorker.h',
@@ skipping 507 matching lines @@
       'webaudio/AudioBasicProcessorHandlerTest.cpp',
       'webaudio/ConvolverNodeTest.cpp',
       'webaudio/DynamicsCompressorNodeTest.cpp',
       'webaudio/ScriptProcessorNodeTest.cpp',
       'webaudio/StereoPannerNodeTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }