Add library names to many sky libraries

sky/examples/stocks/lib/stock_arrow.dart

Index: sky/examples/stocks/lib/stock_arrow.dart
diff --git a/sky/examples/stocks/lib/stock_arrow.dart b/sky/examples/stocks/lib/stock_arrow.dart
index 5395984f25cb2daaed62dc06fe9d2d151eddabf4..8721033b8501eee2bc38c8dec8815e882baac119 100644
--- a/sky/examples/stocks/lib/stock_arrow.dart
+++ b/sky/examples/stocks/lib/stock_arrow.dart
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+library stock_arrow;
+
 import 'dart:math';
 import 'package:sky/framework/fn.dart';
 import 'package:sky/framework/layout.dart';