Add a slimming paint version of the r&r key silk case benchmark

tools/perf/benchmarks/rasterize_and_record_micro.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 benchmark
 
 from measurements import rasterize_and_record_micro
 import page_sets
 
 
@@ skipping 82 matching lines @@
   http://www.chromium.org/developers/design-documents/rendering-benchmarks"""
 
   @classmethod
   def Name(cls):
     return 'rasterize_and_record_micro.key_silk_cases'
 
   def CreatePageSet(self, options):
     return page_sets.KeySilkCasesPageSet(run_no_page_interactions=True)
 
 
+@benchmark.Disabled('mac', 'win', 'android')
+@benchmark.Disabled('reference')
+class RasterizeAndRecordMicroKeySilkWithSlimmingPaint(_RasterizeAndRecordMicro):
+  """Measures rasterize and record on the silk sites with slimming paint.
+
+  http://www.chromium.org/developers/design-documents/rendering-benchmarks"""
+
+  def CustomizeBrowserOptions(self, options):
+    options.AppendExtraBrowserArgs(['--enable-slimming-paint'])
+
+  @classmethod
+  def Name(cls):
+    return 'rasterize_and_record_micro.key_silk_cases_with_slimming_paint'
+
+  def CreatePageSet(self, options):
+    return page_sets.KeySilkCasesPageSet(run_no_page_interactions=True)
+
+
 @benchmark.Enabled('android')
 class RasterizeAndRecordMicroPolymer(_RasterizeAndRecordMicro):
   """Measures rasterize and record performance on the Polymer cases.
 
   http://www.chromium.org/developers/design-documents/rendering-benchmarks"""
 
   @classmethod
   def Name(cls):
     return 'rasterize_and_record_micro.polymer'
 
   def CreatePageSet(self, options):
     return page_sets.PolymerPageSet(run_no_page_interactions=True)