Enable bleeding edge rendering fast paths for Silk benchmarks

tools/perf/benchmarks/rasterize_and_record.py

 # Copyright 2013 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 rasterize_and_record
 
 
 # RasterizeAndRecord disabled on linux because no raster times are reported.
 # TODO: re-enable when unittests are happy on linux.
 
 @test.Disabled('linux')
 class RasterizeAndRecordTop25(test.Test):
   """Measures rasterize and record performance on the top 25 web pages.
 
@@ skipping 11 matching lines @@
   page_set = 'page_sets/key_mobile_sites.json'
 
 
 @test.Disabled('linux')
 class RasterizeAndRecordSilk(test.Test):
   """Measures rasterize and record performance on the silk sites.
 
   http://www.chromium.org/developers/design-documents/rendering-benchmarks"""
   test = rasterize_and_record.RasterizeAndRecord
   page_set = 'page_sets/key_silk_cases.json'
+
+
+class RasterizeAndRecordFastPathSilk(test.Test):
+  """Measures rasterize and record performance on the silk sites.
+
+  Uses bleeding edge rendering fast paths.
+
+  http://www.chromium.org/developers/design-documents/rendering-benchmarks"""
+  tag = 'fast_path'
+  test = rasterize_and_record.RasterizeAndRecord
+  page_set = 'page_sets/key_silk_cases.json'
+  def CustomizeBrowserOptions(self, options):
+    silk_flags.CustomizeBrowserOptionsForFastPath(options)