Add cr-toggle-button to Chrome

ui/webui/resources/cr_elements/cr_events/cr-events.js

+/* 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-events` provides helpers for handling events in Chrome Polymer elements.
+ *
+ * Example:
+ *
+ *    <cr-events></cr-events>
+ *
+ * @element cr-events
+ */
+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) {
+    if (!e.bubbles)
+      return;
+
+    var node = e.path[e.path.length - 1];
+    if (node instanceof ShadowRoot) {
+      // Forward the event to the shadow host.
+      e.stopPropagation();
+      node.host.fire(e.type, detail, node.host, true, e.cancelable);
+    }
+  },
+});