[system-health] Add support for disabling individual stories on individual platforms

tools/perf/benchmarks/system_health_smoke_test.py

 # Copyright 2016 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.
 
 """Run all system health stories used by system health benchmarks.
 
 Only memory benchmarks are used when running these stories to make the total
 cycle time manageable. Other system health benchmarks should be using the same
 stories as memory ones, only with fewer actions (no memory dumping).
 """
@@ skipping 57 matching lines @@
         # pylint: disable=super-on-old-class
         story_set = super(SinglePageBenchmark, self).CreateStorySet(options)
         assert story_to_smoke_test in story_set.stories
         story_set.stories = [story_to_smoke_test]
         return story_set
 
     options = GenerateBenchmarkOptions(benchmark_class)
     possible_browser = browser_finder.FindBrowser(options)
     if possible_browser is None:
       self.skipTest('Cannot find the browser to run the test.')
+
     if (SinglePageBenchmark.ShouldDisable(possible_browser) or
         not decorators.IsEnabled(benchmark_class, possible_browser)[0]):
       self.skipTest('Benchmark %s is disabled' % SinglePageBenchmark.Name())
 
+    if not story_to_smoke_test.CanRun(possible_browser):
+      self.skipTest('Story %s is disabled' % story_to_smoke_test.name)
+
     if self.id() in _DISABLED_TESTS:
       self.skipTest('Test is explictly disabled')
 
     self.assertEqual(0, SinglePageBenchmark().Run(options),
                      msg='Failed: %s' % benchmark_class)
 
   # We attach the test method to SystemHealthBenchmarkSmokeTest dynamically
   # so that we can set the test method name to include
   # '<benchmark class name>.<story display name>'.
   test_method_name = '%s.%s' % (
@@ skipping 45 matching lines @@
     # parsed during test time which happens after load_tests are called.
     # Since none of our system health benchmarks creates stories based on
     # command line options, it should be ok to pass options=None to
     # CreateStorySet.
     for story_to_smoke_test in (
         benchmark_class().CreateStorySet(options=None).stories):
       suite.addTest(
           _GenerateSmokeTestCase(benchmark_class, story_to_smoke_test))
 
   return suite