Introduce InterfaceEndpointClient(IEC), InterfaceEndpointHandle and

ios/web/webui/resources/timer.js

+// Copyright 2017 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 "timer"
+//
+// This module provides basic setTimeout, setInterval support. The reason to
+// define this module to forward calls to setTimeout, setInterval exposed by
+// the browser. Mojo JS bindings are currently loaded using gin
+// and setTimeout, setInterval is not always available. When the Mojo JS

[Eugene But (OOO till 7-30), 2017/03/20 20:53:46]

If this is a workaround, could you please add "TODO(crbug.com/###): Remove this
when..."

[wangjimmy, 2017/03/21 16:53:37]

Done.

+// bindings move away from gin, this module could be removed.
+
+define("timer", [], function() {
+  /**
+   * Logs a message to the console.

[Eugene But (OOO till 7-30), 2017/03/20 20:53:46]

Please update the comment to reflect what this function is doing.

[wangjimmy, 2017/03/21 16:53:37]

Done.

+   * @param {string} message to log.
+   */
+  function createOneShot(delay, callback) {
+    setTimeout(callback, delay);
+  }
+
+  function createRepeating(delay, callback) {

[Eugene But (OOO till 7-30), 2017/03/20 20:53:46]

Please add a comment

[wangjimmy, 2017/03/21 16:53:37]

Done.

+    setInterval(callback, delay);
+  }
+
+  var exports = {};
+  exports.createOneShot = createOneShot;
+  exports.createRepeating = createRepeating;
+  return exports;
+});