Add python wrapper for test.dart.

tools/test_wrapper.py

+#!/usr/bin/env python
+# Copyright (c) 2011, 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 os
+import platform
+import string
+import subprocess
+import sys
+
+from utils import GuessOS
+
+def Main():
+  args = sys.argv[1:]
+  tools_dir = os.path.dirname(os.path.realpath(__file__))
+  dart_binary_prefix = os.path.join(tools_dir, 'testing', 'bin')
+  if GuessOS() == "win32":
+    dart_binary = os.path.join(dart_binary_prefix, 'windows', 'dart.exe')
+  else:
+    dart_binary = os.path.join(dart_binary_prefix, GuessOS(), 'dart')
+  dart_test_script = string.join([tools_dir, 'test.dart'], os.sep)
+  command = [dart_binary, dart_test_script] + args
+  return subprocess.call(command)
+
+if __name__ == '__main__':
+  sys.exit(Main())