Rationalize Dart mojo and sky package structure

sky/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) {
-  return _fieldCache.putIfAbsent(mirror, () {
-    List<Symbol> fields = new List<Symbol>();
-
-    while (mirror != null) {
-      var decls = mirror.declarations;
-      fields.addAll(decls.keys.where((symbol) {
-        var mirror = decls[symbol];
-        if (mirror is! VariableMirror) {
-          return false;
-        }
-
-        var vMirror = mirror as VariableMirror;
-        return !vMirror.isPrivate && !vMirror.isStatic && !vMirror.isFinal;
-      }));
-
-      mirror = mirror.superclass;
-    }
-
-    return fields;
-  });
-}
-
-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);
-  }
-}