Add cr-toggle-button to Chrome

ui/webui/resources/custom_elements/cr/util/cr-util.js

Index: ui/webui/resources/custom_elements/cr/util/cr-util.js
diff --git a/ui/webui/resources/custom_elements/cr/util/cr-util.js b/ui/webui/resources/custom_elements/cr/util/cr-util.js
new file mode 100644
index 0000000000000000000000000000000000000000..df41f006f140dcc7638539cadbd66a4f3e71a71f
--- /dev/null
+++ b/ui/webui/resources/custom_elements/cr/util/cr-util.js
@@ -0,0 +1,30 @@
+/* Copyright 2015 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. */
+
+/**
+ * @fileoverview
+ * `cr-util` provides utility functions for Chrome custom elements.
+ *
+ * Example:
+ *
+ *    <cr-util></cr-util>
+ *
+ * @element cr-util

[Jeremy Klein, 2015/02/05 23:42:11]

I'd like to keep this name a little bit more well-scoped so that it doesn't
become a dumping ground. Maybe cr-events or even cr-event-forwarder?

[michaelpg, 2015/02/06 08:55:43]

Done.

+ */
+Polymer({
+  /**
+   * Forwards events that don't automatically cross the shadow boundary
+   * if the event should bubble.
+   * @param {!Event} e The event to forward.
+   * @param {*} detail Data passed when initializing the event.
+   * @param {Node=} sender Node that declared the handler.
+   */
+  forwardEvent: function(e, detail, sender) {
+    // TODO

[Jeremy Klein, 2015/02/05 23:42:11]

What should this TODO say?

[michaelpg, 2015/02/06 08:55:43]

Fixed

+    if (e.bubbles && sender &&
+        e.path[e.path.length - 1] == sender.shadowRoot) {
+      sender.fire(e.type, detail, e.target, true, e.cancelable);
+    }
+  },
+});