[Telemetry] Allows concatenating multiple Disabled & Enabled decorators

tools/perf/benchmarks/chrome_signin_startup.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.
 
 from core import perf_benchmark
 from measurements import startup
 import page_sets
 from telemetry import benchmark
 
 
 class _StartupWarm(perf_benchmark.PerfBenchmark):
   """Measures warm startup time with a clean profile."""
   options = {'pageset_repeat': 5}
 
   @classmethod
   def Name(cls):
     return 'chrome_signin_starup'
 
   def CreatePageTest(self, options):
     return startup.Startup(cold=False)
 
 
-@benchmark.Disabled  # crbug.com/551938
+@benchmark.Disabled('all')  # crbug.com/551938
 # On android logging in is done through system accounts workflow.
 @benchmark.Disabled('android',
                     'reference') # crbug.com/499312
 class SigninStartup(_StartupWarm):
   """Measures warm startup time of signing a profile into Chrome."""
   page_set = page_sets.ChromeSigninPageSet
 
   @classmethod
   def Name(cls):
     return 'startup.warm.chrome_signin'