Introduce InterfaceEndpointClient(IEC), InterfaceEndpointHandle and

ios/web/webui/resources/timer.js

Index: ios/web/webui/resources/timer.js
diff --git a/ios/web/webui/resources/timer.js b/ios/web/webui/resources/timer.js
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+++ b/ios/web/webui/resources/timer.js
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+// 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 createOneShot, createRepeating support. The
+// reason to define this module is to forward calls to setTimeout, setInterval
+// exposed by the browser. Mojo JS bindings are currently loaded using gin
+// and createOneShot, createRepeating are not always available.
+//
+// TODO(crbug.com/703380): When the Mojo JS bindings move away from gin,
+// this module could be removed.
+
+define("timer", [], function() {
+  /**
+   * Executes a function once after the set time delay.
+   * @param {int} delay Milliseconds to wait before executing the code.
+   * @callback callback
+   */
+  function createOneShot(delay, callback) {
+    setTimeout(callback, delay);
+  }
+
+  /**
+   * Repeatedly executes a function with a fixed time delay between each call.
+   * @param {int} delay Milliseconds to wait between executions of the code
+   * @callback callback
+   */
+  function createRepeating(delay, callback) {
+    setInterval(callback, delay);
+  }
+
+  var exports = {};
+  exports.createOneShot = createOneShot;
+  exports.createRepeating = createRepeating;
+  return exports;
+});