Rationalize Dart mojo and sky package structure

sky/sdk/lib/framework/reflect.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:mirrors';
 import 'dart:collection';
 
 final HashMap<ClassMirror, List> _fieldCache = new HashMap<ClassMirror, List>();
 
 List<Symbol> _getPublicFields(ClassMirror mirror) {
@@ skipping 21 matching lines @@
 
 void copyPublicFields(Object source, Object target) {
   assert(source.runtimeType == target.runtimeType);
 
   var sourceMirror = reflect(source);
   var targetMirror = reflect(target);
   for (var symbol in _getPublicFields(sourceMirror.type)) {
     targetMirror.setField(symbol, sourceMirror.getField(symbol).reflectee);
   }
 }