Apparently I didn't so much _move_ the files as _delete_ the files. Let's re-add them.

sky/sdk/lib/editing/editable_text.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:async';
+
+import '../widgets/basic.dart';
+import 'editable_string.dart';
+
+class EditableText extends Component {
+
+  EditableText({String key, this.value, this.focused})
+      : super(key: key, stateful: true);
+
+  // static final Style _cursorStyle = new Style('''
+  //   width: 2px;
+  //   height: 1.2em;
+  //   vertical-align: top;
+  //   background-color: ${Blue[500]};'''
+  // );
+
+  // static final Style _composingStyle = new Style('''
+  //   text-decoration: underline;'''
+  // );
+
+  EditableString value;
+  bool focused;
+
+  void syncFields(EditableText source) {
+    value = source.value;
+    focused = source.focused;
+  }
+
+  Timer _cursorTimer;
+  bool _showCursor = false;
+
+  void _cursorTick(Timer timer) {
+    setState(() {
+      _showCursor = !_showCursor;
+    });
+  }
+
+  void _startCursorTimer() {
+    _showCursor = true;
+    _cursorTimer = new Timer.periodic(
+        new Duration(milliseconds: 500), _cursorTick);
+  }
+
+  void didUnmount() {
+    if (_cursorTimer != null)
+      _stopCursorTimer();
+    super.didUnmount();
+  }
+
+  void _stopCursorTimer() {
+    _cursorTimer.cancel();
+    _cursorTimer = null;
+    _showCursor = false;
+  }
+
+  Widget build() {
+    if (focused && _cursorTimer == null)
+      _startCursorTimer();
+    else if (!focused && _cursorTimer != null)
+      _stopCursorTimer();
+
+    //List<Widget> children = new List<Widget>();
+    String hack = "";
+
+    if (!value.composing.isValid) {
+      // children.add(new TextFragment(value.text));
+      hack += value.text;
+    } else {
+      hack += value.textBefore(value.composing);
+      hack += value.textInside(value.composing);
+      hack += value.textAfter(value.composing);
+      // if (!composing.isEmpty) {
+      //   children.add(new TextFragment(
+      //     composing,
+      //     key: 'composing',
+      //     style: _composingStyle
+      //   ));
+      // }
+
+      // String afterComposing = value.textAfter(value.composing);
+      // if (!afterComposing.isEmpty)
+      //   children.add(new TextFragment(afterComposing));
+    }
+
+    // if (_showCursor)
+    //   children.add(new Container(
+    //     key: 'cursor',
+    //     // style: _cursorStyle
+    //     ));
+
+    return new Text(hack);
+  }
+}