[DevTools] Refactor connection-related classes.

third_party/WebKit/Source/devtools/front_end/audits2_worker/Audits2Service.js

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
  * @implements {Service}
  */
 function Audits2Service(notify)
 {
@@ skipping 16 matching lines @@
     /**
      * @return {!Promise}
      */
     stop: function()
     {
         console.error("************ WORKER STOP *****************");
         return Promise.resolve();
     },
 
     /**
-     * @param {!Object=} params
+     * @param {{message: !Object|string}} params

[pfeldman, 2016/10/21 21:04:34]

design: we should not use either or typing.

      * @return {!Promise}
      */
     dispatchProtocolMessage: function(params)
     {
-        console.error("message: " + JSON.stringify(params));
+        var message = params.message;
+        if (typeof message !== "string")
+            message = JSON.stringify(message);
+        console.error("message: " + message.substring(0, 100));
         return Promise.resolve();
     },
 
     /**
      * @override
      * @return {!Promise}
      */
     dispose: function()
     {
         console.error("************ WORKER DISPOSE *****************");
         return Promise.resolve();
     }
 }
 
 initializeWorkerService("Audits2Service", Audits2Service);