Add unit test for the repeating button.

chrome/browser/resources/shared/js/cr/ui/repeating_button.js

 // Copyright (c) 2011 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.
 
 cr.define('cr.ui', function() {
   /**
    * Creates a new button element. The repeating button behaves like a
    * keyboard button, which auto-repeats if held. This button is designed
    * for use with controls such as brightness and volume adjustment buttons.
    * @constructor
@@ skipping 124 matching lines @@
         this.intervalCallback_ = undefined;
       }
     },
 
     /**
      * Dispatches the action associated with keeping this button pressed.
      * @private
      */
     buttonHeld_: function() {
       cr.dispatchSimpleEvent(this, RepeatingButton.Event.BUTTON_HELD);
+    },
+
+    /**
+     * Getter for the initial delay before repeating.
+     * @type {number} The delay in milliseconds.
+     */
+    get repeatDelay() {
+      return this.holdDelayTime_;
+    },
+
+    /**
+     * Getter for the repeat interval.
+     * @type {number} The repeat interval in milliseconds.
+     */
+    get repeatInterval() {
+      return this.holdRepeatIntervalTime_;
     }
   };
 
   return {
     RepeatingButton: RepeatingButton
   };
 });