Disable failing tests on chromeos.

tools/perf/measurements/smoothness_unittest.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 sys
 
 from measurements import smoothness
 from metrics import power
 from telemetry.core import exceptions
 from telemetry.core import wpr_modes
 from telemetry.page import page
@@ skipping 109 matching lines @@
     self.assertEquals(len(mostly_smooth), 1)
     self.assertGreaterEqual(mostly_smooth[0].GetRepresentativeNumber(), 0)
 
     mean_input_event_latency = results.FindAllPageSpecificValuesNamed(
         'mean_input_event_latency')
     if mean_input_event_latency:
       self.assertEquals(len(mean_input_event_latency), 1)
       self.assertGreater(
           mean_input_event_latency[0].GetRepresentativeNumber(), 0)
 
-  @test.Disabled('mac')  # http://crbug.com/403903
+  @test.Disabled('mac', 'chromeos')  # http://crbug.com/403903
   def testSmoothnessForPageWithNoGesture(self):
     ps = self.CreateEmptyPageSet()
     ps.AddPage(AnimatedPage(ps))
 
     measurement = smoothness.Smoothness()
     results = self.RunMeasurement(measurement, ps, options=self._options)
     self.assertEquals(0, len(results.failures))
 
     mostly_smooth = results.FindAllPageSpecificValuesNamed('mostly_smooth')
     self.assertEquals(len(mostly_smooth), 1)
@@ skipping 29 matching lines @@
         self.fake_power = self._power_metric = FakePowerMetric(browser)
 
     measurement = BuggyMeasurement()
     try:
       self.RunMeasurement(measurement, ps)
     except page_test.TestNotSupportedOnPlatformFailure:
       pass
 
     self.assertTrue(measurement.fake_power.start_called)
     self.assertTrue(measurement.fake_power.stop_called)