Add TODOs about components needing to adjust to screen size changes.

sky/sdk/lib/framework/components2/floating_action_button.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 '../fn2.dart';
 import '../rendering/box.dart';
 import '../painting/shadows.dart';
 import '../theme2/colors.dart';
 import 'dart:sky' as sky;
 import 'ink_well.dart';
 import 'material.dart';
 
+// TODO(eseidel): This needs to change based on device size?
+// http://www.google.com/design/spec/layout/metrics-keylines.html#metrics-keylines-keylines-spacing
 const double _kSize = 56.0;
 
 class FloatingActionButton extends Component {
 
   FloatingActionButton({ Object key, this.content, this.level: 0 })
       : super(key: key);
 
   final UINode content;
   final int level;
 
@@ skipping 16 matching lines @@
           canvas.drawCircle(radius, radius, radius, paint);
         },
         child: new Container(
           width: _kSize,
           height: _kSize,
           child: new InkWell(children: children))),
       level: level);
   }
 
 }