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

tools/perf/benchmarks/robohornet_pro.py

 # Copyright 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.
 
 """Runs Microsoft's RoboHornet Pro benchmark."""
 
 import os
 
 from metrics import power
 from telemetry import benchmark
@@ skipping 23 matching lines @@
         600)
 
     self._power_metric.Stop(page, tab)
     self._power_metric.AddResults(tab, results)
 
     result = int(tab.EvaluateJavaScript('stopTime - startTime'))
     results.AddValue(
         scalar.ScalarValue(results.current_page, 'Total', 'ms', result))
 
 
-
+# We plan to disable this test because it doesn't give useful data, but

[tonyg, 2014/12/05 21:31:20]

s/disable/remove/

[sullivan, 2014/12/05 21:43:42]

Done.

+# we need to wait until Chrome OS can implement support for more helpful
+# benchmarks.
+@benchmark.Enabled('chromeos')
 class RobohornetPro(benchmark.Benchmark):
   test = _RobohornetProMeasurement
 
   def CreatePageSet(self, options):
     ps = page_set.PageSet(
       archive_data_file='../page_sets/data/robohornet_pro.json',
       # Measurement require use of real Date.now() for measurement.
       make_javascript_deterministic=False,
       file_path=os.path.abspath(__file__),
       bucket=page_set.PARTNER_BUCKET)
     ps.AddPageWithDefaultRunNavigate(
       'http://ie.microsoft.com/testdrive/performance/robohornetpro/')
     return ps