Add ServiceWorkerErrorMessage to ServiceWorker DevTool's protocol.

Source/devtools/front_end/sdk/ServiceWorkerManager.js

 /*
  * Copyright (C) 2011 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 351 matching lines @@
         this._manager._workerRegistrationUpdated(registrations);
     },
 
     /**
      * @override
      * @param {!Array.<!ServiceWorkerAgent.ServiceWorkerVersion>} versions
      */
     workerVersionUpdated: function(versions)
     {
         this._manager._workerVersionUpdated(versions);
+    },
+
+    /**
+     * @override
+     * @param {!ServiceWorkerAgent.ServiceWorkerErrorMessage} errorMessage
+     */
+    workerErrorReported: function(errorMessage)
+    {
+        // FIXME: Implement this.
     }
 }
 
 /**
  * @constructor
  * @extends {InspectorBackendClass.Connection}
  * @param {!Protocol.ServiceWorkerAgent} agent
  * @param {string} workerId
  */
 WebInspector.ServiceWorkerConnection = function(agent, workerId)
@@ skipping 15 matching lines @@
         this._agent.sendMessage(this._workerId, JSON.stringify(messageObject));
     },
 
     _close: function()
     {
         this.connectionClosed("worker_terminated");
     },
 
     __proto__: InspectorBackendClass.Connection.prototype
 }