Split layout2.dart into several files

sky/sdk/lib/framework/components2/ink_splash.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/animated_value.dart';
 import '../animation/curves.dart';
 import '../fn2.dart';
 import '../theme/view_configuration.dart' as config;
 import 'dart:async';
 import 'dart:math' as math;
-import '../layout2.dart';
 
 const double _kSplashConfirmedDuration = 350.0;
 const double _kSplashUnconfirmedDuration = config.kDefaultLongPressTimeout;
 const double _kSplashAbortDuration = 100.0;
 const double _kSplashInitialDelay = 0.0; // we could delay initially in case the user scrolls
 
 double _getSplashTargetSize(Rect rect, double x, double y) {
   return 2.0 * math.max(math.max(x - rect.x, rect.x + rect.width - x),
                         math.max(y - rect.y, rect.y + rect.height - y));
 }
@@ skipping 110 matching lines @@
       style: _clipperStyle,
       children: [
         new Container(
           inlineStyle: _inlineStyle,
           style: _splashStyle
         )
       ]
     );
   }
 }