Support flag --tabset-repeat on benchmark tab_switching

tools/perf/benchmarks/tab_switching.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.
 
+import os
+
 from core import perf_benchmark
 
 from measurements import tab_switching
-import page_sets
+from page_sets.system_health import multi_tab_stories
 from telemetry import benchmark
+from telemetry import story
 
 
 @benchmark.Owner(emails=['vovoy@chromium.org'],
                  component='OS>Performance')
 @benchmark.Enabled('has tabs')
 @benchmark.Disabled('mac')  # http://crbug.com/612774
 @benchmark.Disabled('android')  # http://crbug.com/460084
 class TabSwitchingTypical25(perf_benchmark.PerfBenchmark):
   """This test records the MPArch.RWH_TabSwitchPaintDuration histogram.
 
   The histogram is a measure of the time between when a tab was requested to be
   shown, and when first paint occurred. The script opens 25 pages in different
   tabs, waits for them to load, and then switches to each tab and records the
   metric. The pages were chosen from Alexa top ranking sites.
   """
   test = tab_switching.TabSwitching
 
+  @classmethod
+  def AddBenchmarkCommandLineArgs(cls, parser):
+    parser.add_option('--tabset-repeat', type='int', default=1,
+                      help='repeat tab page set')
+
   def CreateStorySet(self, options):
-    return page_sets.SystemHealthStorySet(platform='desktop',
-                                          case='multitab:misc')
+    story_set = story.StorySet(
+        archive_data_file='../page_sets/data/system_health_desktop.json',
+        base_dir=os.path.dirname(os.path.abspath(__file__)),
+        cloud_storage_bucket=story.PARTNER_BUCKET)
+    story_set.AddStory(multi_tab_stories.MultiTabTypical24Story(
+        story_set, False, options.tabset_repeat))
+    return story_set
 
   @classmethod
   def Name(cls):
     return 'tab_switching.typical_25'
 
   @classmethod
   def ShouldTearDownStateAfterEachStoryRun(cls):
     return False