Disable flaky BenchmarkSmokeTest.thread_times.simple_mobile_sites

TBR=tonyg

BUG=366899, 400747

Review URL: https://codereview.chromium.org/439943003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287544 0039d316-1c4b-4281-b951-d872f2087c98

tools/perf/benchmarks/benchmark_unittest.py

@@ -23,6 +23,8 @@ def SmokeTestGenerator(benchmark):
   # fail, instead of this entire smoke test suite.
   # TODO(achuith): Multiple tests failing on CrOS. crbug.com/351114
   @benchmark_module.Disabled('chromeos')
+  # Flaky, http://crbug.com/400747 .
+  @benchmark_module.Disabled('mac')
   def BenchmarkSmokeTest(self):
     # Only measure a single page so that this test cycles reasonably quickly.
     benchmark.options['pageset_repeat'] = 1