Rationalize Dart mojo and sky package structure

sky/sdk/lib/framework/components/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 '../fn.dart';
 import '../layout.dart';
 import 'dart:collection';
 import 'dart:sky' as sky;
 import 'ink_splash.dart';
 import 'scrollable.dart';
@@ skipping 99 matching lines @@
   void _splashDone(SplashController splash) {
     if (_splashes == null)
       return;
     setState(() {
       _splashes.remove(splash);
       if (_splashes.length == 0)
         _splashes = null;
     });
   }
 }