Added packages/infra_libs as the first Python package.

packages/infra_libs/infra_libs/time_functions/test/timestamp_test.py

 # 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.
 
 import datetime
 from pytz import timezone
 import unittest
 
 from infra_libs.time_functions import timestamp
 
 
 class TestTimestamps(unittest.TestCase):
   def testTimestamp(self):
     sec_diff = 1000
     my_date = datetime.datetime.utcfromtimestamp(sec_diff)
     self.assertEqual(timestamp.utctimestamp(my_date), float(sec_diff))
 
   def testTimeZoneTimestamp(self):
     sec_diff = 1000
     my_date = datetime.datetime.utcfromtimestamp(sec_diff)
     my_date = my_date.replace(tzinfo=timezone('Etc/GMT-8'))
 
     pst_diff = sec_diff - (8 * 3600.0)
     self.assertEqual(timestamp.utctimestamp(my_date), float(pst_diff))