Introduce InterfaceEndpointClient(IEC), InterfaceEndpointHandle and

ios/web/webui/resources/console.js

 // Copyright 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.
 
 // Module "console"
 //
 // This module provides basic logging support. The reason to define this module
 // to forward calls to the |console| object exposed by the browser, instead of
 // using that object directly: mojo JS bindings are currently loaded using gin
-// and the |console| object is not always available. When the Mojo JS bindings
-// move away from gin, this module could be removed.
+// and the |console| object is not always available.
+//
+// TODO(crbug.com/703380): When the Mojo JS bindings move away from gin,
+// this module could be removed.
 
 define("console", [], function() {
   /**
    * Logs a message to the console.
    * @param {string} message to log.
    */
   function log(message) {
     console.log(message);
   }
 
   var exports = {};
   exports.log = log;
   return exports;
 });