Add annotated steps script for packages testing

tools/bots/packages.py

+#!/usr/bin/python
+
+# Copyright (c) 2014, 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.
+
+import re
+import sys
+
+import bot
+import bot_utils
+
+utils = bot_utils.GetUtils()
+
+PACKAGES_BUILDER = r'packages-(windows|linux|mac)-(core-elements|polymer)'
+
+def PackagesConfig(name, is_buildbot):
+  packages_pattern = re.match(PACKAGES_BUILDER, name)
+  if not packages_pattern:
+    return None
+  system = packages_pattern.group(1)
+  
+  return bot.BuildInfo('none', 'vm', 'release', system, checked=True)
+
+def PackagesSteps(build_info):
+  with bot.BuildStep('Testing packages'):
+    bot_name, _ = bot.GetBotName()
+    print bot_name
+
+if __name__ == '__main__':
+  bot.RunBot(PackagesConfig, PackagesSteps)