sky-element stocks demo: add splashes and highlights to menu items

sky/framework/sky-icon.sky

 <!--
 // 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.
 -->
 <import src="sky-element.sky" />
 
 <sky-element attributes="type:string, size:number">
 <template>
   <img />
@@ skipping 27 matching lines @@
     _setSize(size);
     _setSrc(type, size);
   }
 
   void typeChanged(String oldValue, String newValue) {
     if (_img != null)
       _setSrc(newValue, size.floor());
   }
 
   void sizeChanged(double oldValue, double newValue) {
-    if (_img != null)
+    if (_img != null) {
       _setSize(newValue.floor());
+      _setSrc(type, newValue.floor());
+    }
   }
 }
 
 _init(script) => register(script, SkyIcon);
 </script>
 </sky-element>