Refactor fn2.dart, since it breached our 1000-line threshold.

sky/sdk/lib/framework/widgets/drawer.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 'dart:math' as math;
+import 'dart:sky' as sky;
+
+import 'package:vector_math/vector_math.dart';
+
 import '../animation/animated_value.dart';
 import '../animation/curves.dart';
-import '../fn2.dart';
 import '../theme2/colors.dart';
 import '../theme2/shadows.dart';
 import 'animated_component.dart';
-import 'dart:math' as math;
-import 'dart:sky' as sky;
-import 'material.dart';
-import 'package:vector_math/vector_math.dart';
+import 'wrappers.dart';
 
 // TODO(eseidel): Draw width should vary based on device size:
 // http://www.google.com/design/spec/layout/structure.html#structure-side-nav
 
 // Mobile:
 // Width = Screen width − 56 dp
 // Maximum width: 320dp
 // Maximum width applies only when using a left nav. When using a right nav,
 // the panel can cover the full width of the screen.
 
@@ skipping 131 matching lines @@
     return new EventListenerNode(
       new Stack([ mask, content ]),
       onPointerDown: controller.handlePointerDown,
       onPointerMove: controller.handlePointerMove,
       onPointerUp: controller.handlePointerUp,
       onPointerCancel: controller.handlePointerCancel
     );
   }
 
 }