Add cr-toggle-button to Chrome

ui/webui/resources/cr_elements/cr_toggle_button/cr-toggle-button.js

Index: ui/webui/resources/cr_elements/cr_toggle_button/cr-toggle-button.js
diff --git a/ui/webui/resources/cr_elements/cr_toggle_button/cr-toggle-button.js b/ui/webui/resources/cr_elements/cr_toggle_button/cr-toggle-button.js
new file mode 100644
index 0000000000000000000000000000000000000000..2564faace8d3e31a55f14df339ba92fde0b5f58b
--- /dev/null
+++ b/ui/webui/resources/cr_elements/cr_toggle_button/cr-toggle-button.js
@@ -0,0 +1,47 @@
+/* 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

[Jeremy Klein, 2015/02/09 19:20:25]

Should we make it the convention to always put the docs in the js instead of the
html? I'm fine with that, just wanted to note it so that we're consistent moving
forward.

[michaelpg, 2015/02/09 22:11:19]

I think that's the right thing to do for the sake of Closure compiling.

+ * `cr-toggle-button` provides a switch the user can toggle on or off by
+ * tapping or by dragging. Wraps a `paper-toggle-button`.
+ *
+ * Example:
+ *
+ *    <cr-toggle-button></cr-toggle-button>
+ *
+ * @element cr-toggle-button
+ */
+Polymer({
+  publish: {
+    /**
+     * Gets or sets the state. `true` is checked and `false` is unchecked.
+     *
+     * @attribute checked
+     * @type boolean
+     * @default false
+     */
+    checked: {
+      value: false,
+      reflect: true,
+    },
+
+    /**
+     * If true, the toggle button is disabled.
+     *
+     * @attribute disabled
+     * @type boolean
+     * @default false
+     */
+    disabled: {
+      value: false,
+      reflect: true,
+    },
+  },
+
+  ready: function() {
+    this.$['toggle-button'].addEventListener('change',
+                                             this.$.events.forwardEvent);

[stevenjb, 2015/02/09 18:33:00]

Question: Is the <cr-events> element useful without adding this event listener?
If not, should we add this snippit to the Example section of cr-events.js?

[michaelpg, 2015/02/09 22:11:19]

no, yes, done

+  },
+});