Adding a test for measuring memory usage.

tools/perf/perf_tools/scrolling_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.
 import os
 
 from telemetry import multi_page_benchmark
 from telemetry import util
 
 class DidNotScrollException(multi_page_benchmark.MeasurementFailure):
   def __init__(self):
@@ skipping 58 matching lines @@
       util.WaitFor(lambda: tab.runtime.Evaluate(
           'window.__renderingStatsDeltas'), 60)
 
       rendering_stats_deltas = tab.runtime.Evaluate(
         'window.__renderingStatsDeltas')
 
       if not (rendering_stats_deltas['numFramesSentToScreen'] > 0):
         raise DidNotScrollException()
     return rendering_stats_deltas
 
-  def CustomizeBrowserOptions(self, options):
+  def CustomizeBrowserOptions(self, pages, options):
     if not options.no_gpu_benchmarking_extension:
       options.extra_browser_args.append('--enable-gpu-benchmarking')
 
   def MeasurePage(self, page, tab, results):
     rendering_stats_deltas = self.ScrollPageFully(page, tab)
     CalcScrollResults(rendering_stats_deltas, results)
     if self.options.report_all_results:
       for k, v in rendering_stats_deltas.iteritems():
         results.Add(k, '', v)