Enable bleeding edge rendering fast paths for Silk benchmarks

tools/perf/benchmarks/thread_times.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 test
 
+from benchmarks import silk_flags
 from measurements import thread_times
 
+
 class ThreadTimesKeySilkCases(test.Test):
   """Measures timeline metrics while performing smoothness action on key silk
   cases."""
   test = thread_times.ThreadTimes
   page_set = 'page_sets/key_silk_cases.json'
   options = {"report_silk_results": True}
 
+
+class ThreadTimesFastPathKeySilkCases(test.Test):
+  """Measures timeline metrics while performing smoothness action on key silk
+  cases using bleeding edge rendering fast paths."""
+  tag = 'fast_path'
+  test = thread_times.ThreadTimes
+  page_set = 'page_sets/key_silk_cases.json'
+  options = {"report_silk_results": True}
+  def CustomizeBrowserOptions(self, options):
+    silk_flags.CustomizeBrowserOptionsForFastPath(options)
+
+
 class LegacySilkBenchmark(ThreadTimesKeySilkCases):
   """Same as thread_times.key_silk_cases but with the old name."""
   @classmethod
   def GetName(cls):
     return "silk.key_silk_cases"
 
 class ThreadTimesFastPathMobileSites(test.Test):
   """Measures timeline metrics while performing smoothness action on
   key mobile sites labeled with fast-path tag.
   http://www.chromium.org/developers/design-documents/rendering-benchmarks"""
   test = thread_times.ThreadTimes
   page_set = 'page_sets/key_mobile_sites.json'
   options = {'page_label_filter' : 'fastpath'}
 
 class LegacyFastPathBenchmark(ThreadTimesFastPathMobileSites):
   """Same as thread_times.fast_path_mobile_sites but with the old name."""
   @classmethod
   def GetName(cls):
     return "fast_path.key_mobile_sites"