Support flag --tabset-repeat on benchmark tab_switching

tools/perf/benchmarks/tab_switching.py

Index: tools/perf/benchmarks/tab_switching.py
diff --git a/tools/perf/benchmarks/tab_switching.py b/tools/perf/benchmarks/tab_switching.py
index a451fec2256ac0a641663c264e14ca32de4d1674..b1cf856ba0e07c7e771c11229e6bfcc52483f381 100644
--- a/tools/perf/benchmarks/tab_switching.py
+++ b/tools/perf/benchmarks/tab_switching.py
@@ -2,11 +2,14 @@
 # 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'],
@@ -24,9 +27,19 @@ class TabSwitchingTypical25(perf_benchmark.PerfBenchmark):
   """
   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

[perezju, 2017/04/21 11:59:48]

Hmm, this doesn't make me supper happy. But I guess we don't have a cleaner way
to get the options to the stories.

Ned, maybe something to think about if we would like to provide such an
interface?

Anyway, I'm OK with landing this change for now.

[nednguyen, 2017/04/21 12:14:02]

I think in general, we should not allow people parameterizing system health
story, so this case is more like an exception.

 
   @classmethod
   def Name(cls):