Re-enable media.tough_video_cases on Mac

tools/perf/benchmarks/media.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 core import perf_benchmark
 
 from telemetry import benchmark
 from telemetry.page import legacy_page_test
 from telemetry.value import list_of_scalar_values
 from telemetry.value import scalar
@@ skipping 21 matching lines @@
 
       else:
         results.AddValue(scalar.ScalarValue(
             results.current_page, trace_name, units='ms',
             value=float(metrics[m]), important=True))
 
 
 # android: See media.android.tough_video_cases below
 # win8: crbug.com/531618
 # win7: crbug.com/555079
-# mac: crbug.com/595665
 # crbug.com/565180: Only include cases that report time_to_play
-@benchmark.Disabled('android', 'win8', 'win7', 'mac')
+@benchmark.Disabled('android', 'win8', 'win7')
 class Media(perf_benchmark.PerfBenchmark):
   """Obtains media metrics for key user scenarios."""
   test = media.Media
   page_set = page_sets.ToughVideoCasesPageSet
 
   @classmethod
   def Name(cls):
     return 'media.tough_video_cases'
 
 
@@ skipping 84 matching lines @@
 
   @classmethod
   def Name(cls):
     return 'media.mse_cases'
 
   def SetExtraBrowserOptions(self, options):
     # Needed to allow XHR requests to return stream objects.
     options.AppendExtraBrowserArgs(
         ['--enable-experimental-web-platform-features',
          '--disable-gesture-requirement-for-media-playback'])