Add type annotations to media_controls.js.

ui/file_manager/file_manager/common/js/util.js

Index: ui/file_manager/file_manager/common/js/util.js
diff --git a/ui/file_manager/file_manager/common/js/util.js b/ui/file_manager/file_manager/common/js/util.js
index 282eac03eaef752fb4bdaa801d3321b8c98aad57..2d9952df7917a2cb7b14415c103d1bdd1cda399f 100644
--- a/ui/file_manager/file_manager/common/js/util.js
+++ b/ui/file_manager/file_manager/common/js/util.js
@@ -402,10 +402,10 @@ util.AppCache.getValue = function(key, callback) {
 };
 
 /**
- * Update the cache.
+ * Updates the cache.
  *
  * @param {string} key Key.
- * @param {string} value Value. Remove the key if value is null.
+ * @param {?(string|number)} value Value. Remove the key if value is null.
  * @param {number=} opt_lifetime Maximum time to keep an item (in milliseconds).
  */
 util.AppCache.update = function(key, value, opt_lifetime) {