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

sky/sdk/lib/framework/widgets/ink_well.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 '../animation/animated_value.dart';
 import '../animation/curves.dart';
-import '../fn2.dart';
 import '../rendering/box.dart';
 import '../rendering/flex.dart';
 import '../rendering/object.dart';
-import 'dart:async';
-import 'dart:collection';
-import 'dart:math' as math;
-import 'dart:sky' as sky;
+import 'ui_node.dart';
+import 'wrappers.dart';
 
 const int _kSplashInitialOpacity = 0x80;
 const double _kSplashInitialDelay = 0.0; // we could delay initially in case the user scrolls
 const double _kSplashInitialSize = 0.0;
 const double _kSplashConfirmedVelocity = 0.3;
 const double _kSplashUnconfirmedVelocity = 0.1;
 
 double _getSplashTargetSize(Size bounds, Point position) {
   return math.max(math.max(position.x, bounds.width - position.x),
                   math.max(position.y, bounds.height - position.y));
@@ skipping 92 matching lines @@
   UINode build() {
     return new InkWellWrapper(
       child: new Flex(
         children,
         direction: FlexDirection.horizontal,
         justifyContent: FlexJustifyContent.center
       )
     );
   }
 }