cc: Improve frame/commit accounting

tools/perf/perf_tools/texture_upload_benchmark.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.
 from chrome_remote_control import multi_page_benchmark
 from perf_tools import scrolling_benchmark
 
 class TextureUploadBenchmark(scrolling_benchmark.ScrollingBenchmark):
   def MeasurePage(self, page, tab, results):
     rendering_stats_deltas = self.ScrollPageFully(page, tab)
 
     if (('totalCommitCount' not in rendering_stats_deltas)
         or rendering_stats_deltas['totalCommitCount'] == 0) :
       averageCommitTimeMs = 0
     else :
       averageCommitTimeMs = (
           1000 * rendering_stats_deltas['totalCommitTimeInSeconds'] /
           rendering_stats_deltas['totalCommitCount'])
 
     results.Add('texture_upload_count', 'count',
                 rendering_stats_deltas['textureUploadCount'])
     results.Add('average_commit_time', 'ms', averageCommitTimeMs)
 
+    commitEfficiency = (
+        rendering_stats_deltas["totalCommitCount"] /
+        float(rendering_stats_deltas["vsyncCount"]))
+    results.Add('commit_efficiency', 'fraction', commitEfficiency)
+
 def Main():
   return multi_page_benchmark.Main(TextureUploadBenchmark())