Add a retry to Chromoting tests on Linux builders.

testing/chromoting/chromoting_test_utilities.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.
 
 """Utility script to run tests on the Chromoting bot."""
 
 import hashlib
 import os
 from os.path import expanduser
 import re
@@ skipping 11 matching lines @@
 NATIVE_MESSAGING_DIR = 'NativeMessagingHosts'
 # On a Swarming bot where these tests are executed, a temp folder is created
 # under which the files specified in an .isolate are copied. This temp folder
 # has a random name, which we'll store here for use later.
 # Note that the test-execution always starts from the testing/chromoting folder
 # under the temp folder.
 ISOLATE_CHROMOTING_HOST_PATH = 'remoting/host/linux/linux_me2me_host.py'
 ISOLATE_TEMP_FOLDER = os.path.abspath(os.path.join(os.getcwd(), '../..'))
 CHROMOTING_HOST_PATH = os.path.join(ISOLATE_TEMP_FOLDER,
                                     ISOLATE_CHROMOTING_HOST_PATH)
+MAX_RETRIES = 1
 
 
 class HostOperationFailedException(Exception):
   pass
 
 
 def RunCommandInSubProcess(command):
   """Creates a subprocess with command-line that is passed in.
 
   Args:
@@ skipping 209 matching lines @@
   with open(host_log_file, 'r') as log_file:
     for line in log_file:
       # The host JID will be recorded in a line saying 'Signaling
       # connected'.
       if 'Signaling connected. ' in line:
         components = line.split(':')
         host_jid = components[-1].lstrip()
         break
 
   return host_jid