Fix imports

build/android/run_tests.py

 #!/usr/bin/python
 # Copyright (c) 2011 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.
 
 """Runs all the native unit tests.
 
 1. Copy over test binary to /data/local on device.
 2. Resources: chrome/unit_tests requires resources (chrome.pak and en-US.pak)
    to be deployed to the device (in /data/local/tmp).
@@ skipping 34 matching lines @@
 additonal filter file which lists the tests only failed in emulator will be
 loaded. We don't care about the rare testcases which succeeded on emuatlor, but
 failed on device.
 """
 
 import logging
 import os
 import re
 import subprocess
 import sys
+import time
 
 import android_commands
 import cmd_helper
 import debug_info
 import emulator
 import run_tests_helper
 from single_test_runner import SingleTestRunner
 from test_package_executable import TestPackageExecutable
 from test_result import BaseTestResult, TestResults
 
@@ skipping 192 matching lines @@
   if len(args) > 1:
     print 'Unknown argument:', args[1:]
     option_parser.print_usage()
     sys.exit(1)
   run_tests_helper.SetLogLevel(options.verbose_count)
   return Dispatch(options)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))