Revert "Removed Dartium SDK libs"

sdk/lib/_chrome/dartium/chrome_dartium.dart

Index: sdk/lib/_chrome/dartium/chrome_dartium.dart
diff --git a/sdk/lib/_chrome/dartium/chrome_dartium.dart b/sdk/lib/_chrome/dartium/chrome_dartium.dart
new file mode 100644
index 0000000000000000000000000000000000000000..716d4324c538b4f991fe75df58a924642c99f7b6
--- /dev/null
+++ b/sdk/lib/_chrome/dartium/chrome_dartium.dart
@@ -0,0 +1,15 @@
+/// Native wrappers for the Chrome Packaged App APIs.
+///
+/// These functions allow direct access to the Packaged App APIs, allowing
+/// Chrome Packaged Apps to be written using Dart.
+///
+/// For more information on these APIs, see the
+/// [Chrome APIs Documentation](http://developer.chrome.com/extensions/api_index.html)
+library _chrome;
+
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// 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.
+
+// DO NOT EDIT
+// Auto-generated dart:_chrome library.