Create associated packages for the dart:collection and dart:async libs.

pkg/typed_data/lib/typed_data.dart

Index: pkg/typed_data/lib/typed_data.dart
diff --git a/pkg/polymer/example/canonicalization/lib/c.dart b/pkg/typed_data/lib/typed_data.dart
similarity index 57%
copy from pkg/polymer/example/canonicalization/lib/c.dart
copy to pkg/typed_data/lib/typed_data.dart
index 362f3e3d642f2e8c969c79de78dcc51bb95c3803..b6619abda07635a32a89972f139ffc80cf1bd868 100644
--- a/pkg/polymer/example/canonicalization/lib/c.dart
+++ b/pkg/typed_data/lib/typed_data.dart
@@ -2,6 +2,9 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library canonicalization.c;
+/**
+ * Utilities and functionality related to the "dart:typed_data" library.
+ */
+library dart.pkg.typed_data;
 
-int c = 0;
+export "package:typed_data/typed_buffers.dart";