Create wrapper script around mojom's generate.dart in the Sky package.

sky/sdk/packages/sky/bin/init.dart

Index: sky/sdk/packages/sky/bin/init.dart
diff --git a/sky/sdk/packages/sky/bin/init.dart b/sky/sdk/packages/sky/bin/init.dart
new file mode 100644
index 0000000000000000000000000000000000000000..7616fec98d38a896d631d8225d1cbf3504992e97
--- /dev/null
+++ b/sky/sdk/packages/sky/bin/init.dart
@@ -0,0 +1,17 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/*
+* This script should be invoked via 'pub run' after 'pub get':
+* $ pub run sky:init
+* NOTE: The 'dart' executable must be on your $PATH for this script to work.
+*/
+
+import 'dart:io';
+
+main(List<String> arguments) {
+  ProcessResult result = Process.runSync('dart', ['-p', 'packages', 'packages/mojom/generate.dart']);
+  stdout.write(result.stdout);
+  stderr.write(result.stderr);
+}