Disable failing perf unit tests on chromeos.

tools/perf/measurements/repaint_unittest.py

 # Copyright 2014 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.core import wpr_modes
 from telemetry import decorators
 from telemetry.page import page as page_module
 from telemetry.unittest_util import options_for_unittests
 from telemetry.unittest_util import page_test_test_case
 
@@ skipping 15 matching lines @@
 
      Runs repaint measurement on a simple page and verifies
      that all metrics were added to the results. The test is purely functional,
      i.e. it only checks if the metrics are present and non-zero.
   """
 
   def setUp(self):
     self._options = options_for_unittests.GetCopy()
     self._options.browser_options.wpr_mode = wpr_modes.WPR_OFF
 
+  @decorators.Disabled('chromeos')  # crbug.com/483212
   def testRepaint(self):
     ps = self.CreateEmptyPageSet()
     ps.AddUserStory(TestRepaintPage(ps, ps.base_dir))
     measurement = repaint.Repaint()
     results = self.RunMeasurement(measurement, ps, options=self._options)
     self.assertEquals(0, len(results.failures))
 
     frame_times = results.FindAllPageSpecificValuesNamed('frame_times')
     self.assertEquals(len(frame_times), 1)
     self.assertGreater(frame_times[0].GetRepresentativeNumber(), 0)
 
     mean_frame_time = results.FindAllPageSpecificValuesNamed('mean_frame_time')
     self.assertEquals(len(mean_frame_time), 1)
     self.assertGreater(mean_frame_time[0].GetRepresentativeNumber(), 0)
 
     frame_time_discrepancy = results.FindAllPageSpecificValuesNamed(
         'frame_time_discrepancy')
     self.assertEquals(len(frame_time_discrepancy), 1)
     self.assertGreater(frame_time_discrepancy[0].GetRepresentativeNumber(), 0)
 
     percentage_smooth = results.FindAllPageSpecificValuesNamed(
         'percentage_smooth')
     self.assertEquals(len(percentage_smooth), 1)
     self.assertGreaterEqual(percentage_smooth[0].GetRepresentativeNumber(), 0)
 
   @decorators.Disabled('android')
   def testCleanUpTrace(self):
     self.TestTracingCleanedUp(repaint.Repaint, self._options)