Add timestamp to AppCache manifest.

dart/site/try/add_time_stamp.py

+#!/usr/bin/env 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 datetime
+import sys
+
+def Main():
+  (_, input_file_name, output_file_name) = sys.argv
+  if not input_file_name or not output_file_name:
+    raise Exception('Missing argument')
+
+  timestamp = str(datetime.datetime.now())
+
+  with open(input_file_name, 'r') as input_file:
+    with open(output_file_name, 'w') as output_file:
+      output_file.write(input_file.read().replace('@@TIMESTAMP@@', timestamp))
+
+
+if __name__ == '__main__':
+  sys.exit(Main())