Update Button to be made of Material

sky/framework/components/fixed_height_scrollable.dart

 // 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 '../animation/fling-curve.dart';
 import '../fn.dart';
 import 'dart:sky' as sky;
 
 abstract class FixedHeightScrollable extends Component {
   // TODO(rafaelw): This component really shouldn't have an opinion
@@ skipping 60 matching lines @@
       }
 
       double drawStart = _scrollOffset + alignmentDelta;
       itemNumber = (drawStart / _itemHeight).floor();
 
       transformStyle =
           'transform: translateY(${(alignmentDelta).toStringAsFixed(2)}px)';
     }
 
     return new Container(
-      style: _style,
+      styles: [_style],
       children: [
         new Container(
-          style: _scrollAreaStyle,
+          styles: [_scrollAreaStyle],
           inlineStyle: transformStyle,
           children: buildItems(itemNumber, drawCount)
         )
       ]
     );
   }
 
   void didUnmount() {
     _stopFling();
   }
@@ skipping 48 matching lines @@
   }
 
   void _handleFlingCancel(sky.GestureEvent event) {
     _stopFling();
   }
 
   void _handleWheel(sky.WheelEvent event) {
     _scrollBy(-event.offsetY);
   }
 }