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diff --git a/native_client_sdk/src/examples/tumbler/bind.js b/native_client_sdk/src/examples/tumbler/bind.js
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+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview  This class implements an extension to Function object that
+ * lets you bind a scope for |this| to a function.
+ */
+
+/**
+ * Bind a scope to a function.  Used to bind an object to |this| for event
+ * handlers.
+ * @param {!Object} scope The scope in which the function executes.  |scope|
+ *     becomes |this| during function execution.
+ * @return {function} the bound version of the original function.
+ */
+Function.prototype.bind = function(scope) {
+  var boundContext = this;
+  return function() {
+    return boundContext.apply(scope, arguments);
+  }
+}