[Telemetry] Add tabswitching.typical_25 benchmark

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.
 
 from telemetry import test
 
 from measurements import tab_switching
 
 
 class TabSwitchingTop10(test.Test):
   test = tab_switching.TabSwitching
   page_set = 'page_sets/top_10.py'
 
 
+class TabSwitchingTypical25(test.Test):
+  test = tab_switching.TabSwitching
+  page_set = 'page_sets/typical_25.py'
+
+
 class TabSwitchingFiveBlankTabs(test.Test):
   test = tab_switching.TabSwitching
   page_set = 'page_sets/five_blank_pages.py'
   options = {'pageset_repeat': 10}
 
 
 @test.Disabled('android')  # crbug.com/379561
 class TabSwitchingToughEnergyCases(test.Test):
   test = tab_switching.TabSwitching
   page_set = 'page_sets/tough_energy_cases.py'
   options = {'pageset_repeat': 10}