ServiceWorker: Add initial implementation of ExtendableMessageEvent behind a flag

third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextClient.h

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 90 matching lines @@
 
     // Called when the console message is reported.
     virtual void reportConsoleMessage(int source, int level, const WebString& message, int lineNumber, const WebString& sourceURL) { }
 
     // Inspector related messages.
     virtual void sendDevToolsMessage(int sessionId, int callId, const WebString& message, const WebString& state) { }
 
     // ServiceWorker specific method.
     virtual void didHandleActivateEvent(int eventID, WebServiceWorkerEventResult result) { }
 
+    // Called after ExtendableMessageEvent is handled by the ServiceWorker's
+    // script context.
+    virtual void didHandleExtendableMessageEvent(int eventID, WebServiceWorkerEventResult result) {}

[falken, 2016/01/29 09:47:52]

nit: The other functions are "{ }"

[nhiroki, 2016/02/01 02:05:28]

Done.

+
     // ServiceWorker specific methods. Called after FetchEvent is handled by the
     // ServiceWorker's script context. When no response is provided, the browser
     // should fallback to native fetch.
     virtual void didHandleFetchEvent(int fetchEventID) { }
     virtual void didHandleFetchEvent(int fetchEventID, const WebServiceWorkerResponse& response) { }
 
     // ServiceWorker specific method. Called after InstallEvent (dispatched
     // via WebServiceWorkerContextProxy) is handled by the ServiceWorker's
     // script context.
     virtual void didHandleInstallEvent(int installEventID, WebServiceWorkerEventResult result) { }
@@ skipping 66 matching lines @@
     virtual void navigate(const WebString& uuid, const WebURL&, WebServiceWorkerClientCallbacks*) { BLINK_ASSERT_NOT_REACHED(); }
 
     // Called when the worker wants to register subscopes to handle via foreign
     // fetch. Will only be called while an install event is in progress.
     virtual void registerForeignFetchScopes(const WebVector<WebURL>& subScopes) { BLINK_ASSERT_NOT_REACHED(); }
 };
 
 } // namespace blink
 
 #endif // WebServiceWorkerContextClient_h