[Telemetry] Allows concatenating multiple Disabled & Enabled decorators

tools/telemetry/telemetry/internal/backends/chrome/cros_unittest.py

 # Copyright 2014 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 logging
 import urllib2
 import os
 
 from telemetry.core import exceptions
 from telemetry.core import util
@@ skipping 47 matching lines @@
     if self._is_guest:
       return
     with self._CreateBrowser(autotest_ext=True) as b:
       extension = self._GetAutotestExtension(b)
       try:
         extension.ExecuteJavaScript('chrome.autotestPrivate.logout();')
       except exceptions.Error:
         pass
       util.WaitFor(lambda: not self._IsCryptohomeMounted(), 20)
 
-  @decorators.Disabled
+  @decorators.Disabled('all')
   def testGaiaLogin(self):
     """Tests gaia login. Credentials are expected to be found in a
     credentials.txt file, with a single line of format username:password."""
     if self._is_guest:
       return
     username = 'powerloadtest@gmail.com'
     password = urllib2.urlopen(
         'https://sites.google.com/a/chromium.org/dev/chromium-os/testing/'
         'power-testing/pltp/pltp').read().rstrip()
     with self._CreateBrowser(gaia_login=True,
@@ skipping 66 matching lines @@
     self.assertTrue(self._IsScreenLocked(browser))
 
   def _UnlockScreen(self, browser):
     logging.info('Unlocking')
     browser.oobe.ExecuteJavaScript('''
         Oobe.authenticateForTesting('%s', '%s');
     ''' % (self._username, self._password))
     util.WaitFor(lambda: not browser.oobe_exists, 10)
     self.assertFalse(self._IsScreenLocked(browser))
 
-  @decorators.Disabled
+  @decorators.Disabled('all')
   def testScreenLock(self):
     """Tests autotestPrivate.screenLock"""
     if self._is_guest:
       return
     with self._CreateBrowser(autotest_ext=True) as browser:
       self._LockScreen(browser)
       self._AttemptUnlockBadPassword(browser)
       self._UnlockScreen(browser)