power_LoadTest: custom tasks param allows for parallel tasks

client/site_tests/power_LoadTest/power_LoadTest.py

 # Copyright (c) 2011 The Chromium OS 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 logging, os, shutil, time
 from autotest_lib.client.bin import utils
 from autotest_lib.client.common_lib import error
 from autotest_lib.client.cros import backchannel, cros_ui, cros_ui_test
 from autotest_lib.client.cros import httpd, login, power_status
 from autotest_lib.client.cros import flimflam_test_path
@@ skipping 60 matching lines @@
         self._should_scroll = should_scroll
         self._should_scroll_up = should_scroll_up
         self._scroll_loop = scroll_loop
         self._scroll_interval_ms = scroll_interval_ms
         self._scroll_by_pixels = scroll_by_pixels
         self._tmp_keyvals = {}
         self._power_status = power_status.get_status()
         self._json_path = None
         self._force_wifi = force_wifi
         self._testServer = None
-        self._tasks = '\'' + tasks + '\''
+        self._tasks = '\'' + tasks.replace(' ','') + '\''
 
         # verify that initial conditions are met:
         if self._power_status.linepower[0].online:
             raise error.TestError(
                 'Running on AC power. Please remove AC power cable')
 
         percent_initial_charge = self._percent_current_charge()
         if percent_initial_charge_min and percent_initial_charge < \
                                           percent_initial_charge_min:
             raise error.TestError('Initial charge (%f) less than min (%f)'
@@ skipping 238 matching lines @@
         # set backlight level to 40% of max
         cmd = 'backlight-tool --set_brightness %d ' % (
               int(self._max_backlight * 0.4))
         os.system(cmd)
 
         # record brightness level
         cmd = 'backlight-tool --get_brightness'
         level = int(utils.system_output(cmd).rstrip())
         logging.info('backlight level is %d' % level)
         self._tmp_keyvals['level_backlight_current'] = level