Add unit test for the repeating button.

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

Index: chrome/browser/resources/shared/js/cr/ui/repeating_button.js
diff --git a/chrome/browser/resources/shared/js/cr/ui/repeating_button.js b/chrome/browser/resources/shared/js/cr/ui/repeating_button.js
index 43807bbc6ad88726764b352b172ac5522c5b1616..53f4770accf53e023752f14c2df115541e5a0f10 100644
--- a/chrome/browser/resources/shared/js/cr/ui/repeating_button.js
+++ b/chrome/browser/resources/shared/js/cr/ui/repeating_button.js
@@ -142,6 +142,22 @@ cr.define('cr.ui', function() {
      */
     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_;
     }
   };