Extend the sky color picker example

sky/examples/color/color-sample.sky

-#!mojo mojo:sky_viewer
 <!--
 // 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.
 -->
-<sky>
 <import src="/sky/framework/sky-element/sky-element.sky" as="SkyElement" />
-<import src="example-scaffold.sky" />
 
-<sky-element name="example-app">
+<sky-element name="color-sample" attributes="color:string">
 <template>
-  <example-scaffold>
-    <div class="title">Awesome app</div>
-    <div class="menu">This is a menu</div>
-    <div class="body">This is an awesome app.</div>
-  </example-scrollable>
+  <style>
+    :host {
+      background-color: {{ color }};
+    }
+  </style>
 </template>
 <script>
 module.exports = class extends SkyElement {
+  created() {
+    this.color = "blue"; // "#FFFFFF";
+  }
 }.register();
 </script>
 </sky-element>
-
-<example-app />
-</sky>