Remove one more use of mirrors: Components now have to explicitly sync their fields.

sky/sdk/lib/framework/components2/input.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 '../editing2/editable_string.dart';
 import '../editing2/editable_text.dart';
 import '../editing2/keyboard.dart';
 import '../fn2.dart';
 import '../theme2/colors.dart';
 import '../theme2/typography.dart' as typography;
@@ skipping 32 matching lines @@
   //   top: 8px;
   //   left: 8px;
   //   position: absolute;
   //   ${typography.black.caption};'''
   // );
 
   // static final String _focusedInlineStyle = '''
   //   padding: 7px;
   //   border-bottom: 2px solid ${Blue[500]};''';
 
+  String placeholder;
   ValueChanged onChanged;
-  String placeholder;
   bool focused = false;
 
+  void syncFields(Input source) {
+    placeholder = source.placeholder;
+    onChanged = source.onChanged;
+    focused = source.focused;
+    super.syncFields(source);
+  }
+
   String _value = '';
   bool _isAttachedToKeyboard = false;
   EditableString _editableValue;
 
   void _handleTextUpdated() {
     scheduleBuild();
     if (_value != _editableValue.text) {
       _value = _editableValue.text;
       if (onChanged != null)
         onChanged(_value);
@@ skipping 22 matching lines @@
         direction: FlexDirection.vertical,
         // style: _style,
         // inlineStyle: focused ? _focusedInlineStyle : null,
         children: children
       ),
       onPointerDown: (sky.Event e) => keyboard.showByRequest()
     );
   }
 
 }