telemetry: support old builds that still use disable-gesture-requirement-for-media-playback flag.

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.timeline import chrome_trace_category_filter
 from telemetry.value import list_of_scalar_values
@@ skipping 138 matching lines @@
     return cls.IsSvelte(possible_browser)
 
   @classmethod
   def Name(cls):
     return 'media.android.tough_video_cases_tbmv2'
 
   def SetExtraBrowserOptions(self, options):
     # By default, Chrome on Android does not allow autoplay
     # of media: it requires a user gesture event to start a video.
     # The following option works around that.
-    options.AppendExtraBrowserArgs(['--ignore-autoplay-restrictions'])
+    # Note that both of these flags should be used until every build from
+    # ToT to Stable switches over to one flag or another. This is to support
+    # reference builds.
+    options.AppendExtraBrowserArgs(
+        ['--ignore-autoplay-restrictions',
+         '--disable-gesture-requirement-for-media-playback'])
 
 
 # This isn't running anywhere. See crbug/709161.
 @benchmark.Enabled('chromeos')
 @benchmark.Owner(emails=['crouleau@chromium.org'],
                  component='Internals>Media')
 class MediaChromeOS4kOnly(perf_benchmark.PerfBenchmark):
   """Benchmark for media performance on ChromeOS using only is_4k test content.
   """
   test = media.Media
@@ skipping 41 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',
          '--ignore-autoplay-restrictions'])