[Telemetry] Allows concatenating multiple Disabled & Enabled decorators

tools/perf/measurements/task_execution_time_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.
 
 from telemetry import decorators
 from telemetry.internal.results import page_test_results
 from telemetry.page import page as page_module
 from telemetry.testing import options_for_unittests
 from telemetry.testing import page_test_test_case
 from telemetry.timeline import model as model_module
@@ skipping 30 matching lines @@
   def testSomeResultsReturnedFromDummyPage(self):
     self._GenerateDataForEmptyPageSet()
 
     results = self.RunMeasurement(self._measurement,
                                   self._page_set,
                                   options=self._options)
 
     self.assertGreater(len(results.all_page_specific_values), 0)
 
   # http://crbug.com/466994
-  @decorators.Disabled
+  @decorators.Disabled('all')
   def testSlicesConformToRequiredNamingConventionsUsingDummyPage(self):
     """This test ensures the presence of required keywords.
 
        Some arbitrary keywords are required to generate the names of the top 10
        tasks. The code has a weak dependancy on 'src_func', 'class' and 'line'
        existing; if they exist in a slice's args they are used to generate a
        name, if they don't exists the code falls back to using the name of the
        slice, which is less clear.
 
        If the code has been refactored and these keywords no longer exist
@@ skipping 203 matching lines @@
         None,
         'category',
         name,
         timestamp,
         duration,
         timestamp,
         duration,
         [])
     self._renderer_thread.all_slices.append(new_slice)
     return new_slice