cc: Add best_record_time to rendering stats.

tools/perf/measurements/rasterize_and_record.py

 # Copyright (c) 2012 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.
 
 import time
 
 from metrics import smoothness
 from telemetry.page import page_measurement
 
 class StatsCollector(object):
@@ skipping 100 matching lines @@
                       default=5,
                       help='Wait time before measurement is taken ' +
                       '(must be long enough to render one frame)')
 
   def CustomizeBrowserOptions(self, options):
     smoothness.SmoothnessMetrics.CustomizeBrowserOptions(options)
     # Run each raster task N times. This allows us to report the time for the
     # best run, effectively excluding cache effects and time when the thread is
     # de-scheduled.
     options.AppendExtraBrowserArgs([
-        '--slow-down-raster-scale-factor=%d' % options.raster_record_repeat,
+        '--slow-down-raster-scale-factor=%d' % int(
+            options.raster_record_repeat),
         # Enable impl-side-painting. Current version of benchmark only works for
         # this mode.
         '--enable-impl-side-painting',
         '--force-compositing-mode',
         '--enable-threaded-compositing'
     ])
 
   def MeasurePage(self, page, tab, results):
     self._metrics = smoothness.SmoothnessMetrics(tab)
 
@@ skipping 51 matching lines @@
     results.Add('total_pixels_rasterized', 'pixels',
                 collector.total_pixels_rasterized,
                 data_type='unimportant')
     results.Add('total_pixels_recorded', 'pixels',
                 collector.total_pixels_recorded,
                 data_type='unimportant')
 
     if self.options.report_all_results:
       for k, v in rendering_stats.iteritems():
         results.Add(k, '', v)