Disable moz, dhtml, and roborhornet_pro benchmarks on all OSes except Chrome OS

tools/perf/benchmarks/page_cycler.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 measurements import page_cycler
 import page_sets
 from telemetry import benchmark
 
 
 class _PageCycler(benchmark.Benchmark):
@@ skipping 14 matching lines @@
 
   def CreatePageTest(self, options):
     return page_cycler.PageCycler(
         page_repeat = options.page_repeat,
         pageset_repeat = options.pageset_repeat,
         cold_load_percent = options.cold_load_percent,
         record_v8_object_stats = options.v8_object_stats,
         report_speed_index = options.report_speed_index)
 
 
+# This is an old page set, we intend to remove it after more modern benchmarks
+# work on CrOS.
+@benchmark.Enabled('chromeos')
 class PageCyclerDhtml(_PageCycler):
   page_set = page_sets.DhtmlPageSet
 
 
 class PageCyclerIntlArFaHe(_PageCycler):
   page_set = page_sets.IntlArFaHePageSet
 
 
 @benchmark.Disabled('win')  # crbug.com/388337
 class PageCyclerIntlEsFrPtBr(_PageCycler):
@@ skipping 11 matching lines @@
 
 @benchmark.Disabled('xp')  # crbug.com/434366
 class PageCyclerIntlKoThVi(_PageCycler):
   page_set = page_sets.IntlKoThViPageSet
 
 
 class PageCyclerMorejs(_PageCycler):
   page_set = page_sets.MorejsPageSet
 
 
+# This is an old page set, we intend to remove it after more modern benchmarks
+# work on CrOS.
+@benchmark.Enabled('chromeos')
 class PageCyclerMoz(_PageCycler):
   page_set = page_sets.MozPageSet
 
 
 @benchmark.Disabled('linux', 'win')  # crbug.com/353260
 class PageCyclerNetsimTop10(_PageCycler):
   """Measures load time of the top 10 sites under simulated cable network."""
   tag = 'netsim'
   page_set = page_sets.Top10PageSet
   options = {
@@ skipping 25 matching lines @@
 @benchmark.Disabled('android')  # crbug.com/357326
 class PageCyclerToughLayoutCases(_PageCycler):
   page_set = page_sets.ToughLayoutCasesPageSet
 
 
 # crbug.com/273986: This test is really flakey on xp.
 # cabug.com/341843: This test is always timing out on Android.
 @benchmark.Disabled('android', 'win')
 class PageCyclerTypical25(_PageCycler):
   page_set = page_sets.Typical25PageSet