SmoothnessUnitTest/testSmoothness is flaky on linux.

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
 import unittest
 
 from telemetry import decorators
 from telemetry.page import page
 from telemetry.testing import options_for_unittests
 from telemetry.testing import page_test_test_case
@@ skipping 92 matching lines @@
     actual_synthetic_delay = (
         config.chrome_trace_config.category_filter.synthetic_delays)
 
     if expected_synthetic_delay != actual_synthetic_delay:
       sys.stderr.write('Expected category filter: %s\n' %
                        repr(expected_synthetic_delay))
       sys.stderr.write('Actual category filter filter: %s\n' %
                        repr(actual_synthetic_delay))
     self.assertEquals(expected_synthetic_delay, actual_synthetic_delay)
 
-  @decorators.Disabled('chromeos')  # crbug.com/483212
+  # crbug.com/483212 and crbug.com/713260
+  @decorators.Disabled('chromeos', 'linux')
   def testSmoothness(self):
     ps = self.CreateStorySetFromFileInUnittestDataDir('scrollable_page.html')
     measurement = smoothness.Smoothness()
     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)
 
@@ skipping 36 matching lines @@
     max_frame_delay = results.FindAllPageSpecificValuesNamed('max_frame_delay')
     self.assertEquals(1, len(max_frame_delay))
     self.assertGreater(max_frame_delay[0].GetRepresentativeNumber, 0)
 
     frame_lengths = results.FindAllPageSpecificValuesNamed('frame_lengths')
     self.assertEquals(1, len(frame_lengths))
     self.assertGreater(frame_lengths[0].GetRepresentativeNumber, 0)
 
   def testCleanUpTrace(self):
     self.TestTracingCleanedUp(smoothness.Smoothness, self._options)