Make the crypto library an official dart:crypto library.

runtime/bin/crypto_sources.gypi

Index: runtime/bin/crypto_sources.gypi
diff --git a/runtime/bin/crypto_sources.gypi b/runtime/bin/crypto_sources.gypi
new file mode 100644
index 0000000000000000000000000000000000000000..9093cf20855ce208c5fc3c9a98b53a57d842a068
--- /dev/null
+++ b/runtime/bin/crypto_sources.gypi
@@ -0,0 +1,16 @@
+# Copyright (c) 2012, 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.
+
+# This file contains all sources for the dart:crypto library.
+{
+  'sources': [
+    '../../lib/crypto/crypto_vm.dart',
+    '../../lib/crypto/crypto_utils.dart',
+    '../../lib/crypto/hash_utils.dart',
+    '../../lib/crypto/hmac.dart',
+    '../../lib/crypto/md5.dart',
+    '../../lib/crypto/sha1.dart',
+    '../../lib/crypto/sha256.dart',
+  ],
+}