Add option to restart usb on device status check before performing check.

build/android/buildbot/bb_utils.py

 # Copyright 2013 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 json
 import optparse
 import os
 import pipes
 import subprocess
 import sys
@@ skipping 27 matching lines @@
 
 def SpawnCmd(command, stdout=None, cwd=CHROME_SRC):
   """Spawn a process without waiting for termination."""
   print '>', CommandToString(command)
   sys.stdout.flush()
   if TESTING:
     class MockPopen(object):
       @staticmethod
       def wait():
         return 0
+      @staticmethod
+      def communicate():
+        return '', ''
     return MockPopen()
   return subprocess.Popen(command, cwd=cwd, stdout=stdout)
 
 
 def RunCmd(command, flunk_on_failure=True, halt_on_failure=False,
            warning_code=constants.WARNING_EXIT_CODE, stdout=None,
            cwd=CHROME_SRC):
   """Run a command relative to the chrome source root."""
   code = SpawnCmd(command, stdout, cwd).wait()
   print '<', CommandToString(command)
@@ skipping 30 matching lines @@
 
 def RunSteps(steps, step_cmds, options):
   unknown_steps = set(steps) - set(step for step, _ in step_cmds)
   if unknown_steps:
     print >> sys.stderr, 'FATAL: Unknown steps %s' % list(unknown_steps)
     sys.exit(1)
 
   for step, cmd in step_cmds:
     if step in steps:
       cmd(options)