Fork some more files from the old framework, so that the transition will be easier to perform.

sky/sdk/lib/animation/animated_value.dart

Index: sky/sdk/lib/animation/animated_value.dart
diff --git a/sky/sdk/lib/framework/animation/animated_value.dart b/sky/sdk/lib/animation/animated_value.dart
similarity index 99%
copy from sky/sdk/lib/framework/animation/animated_value.dart
copy to sky/sdk/lib/animation/animated_value.dart
index 071f6926bccbd251e57a5981d84f5ef6e03a495b..1511ed2202c6aa9a4569b7731d0f7072e0fb2a7e 100644
--- a/sky/sdk/lib/framework/animation/animated_value.dart
+++ b/sky/sdk/lib/animation/animated_value.dart
@@ -2,8 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'curves.dart';
 import 'dart:async';
+
+import 'curves.dart';
 import 'generators.dart';
 
 typedef void Callback ();