[Telemetry] Add CanRunOnPlatform to story_runner and benchmark class.

telemetry/telemetry/benchmark.py

Index: telemetry/telemetry/benchmark.py
diff --git a/telemetry/telemetry/benchmark.py b/telemetry/telemetry/benchmark.py
index 3cea7caa5cd21ff0108665eaf34c33414e432ff4..300b8877d647fc2995ee880de2b706ae21f03bb3 100644
--- a/telemetry/telemetry/benchmark.py
+++ b/telemetry/telemetry/benchmark.py
@@ -63,6 +63,7 @@ class Benchmark(command_line.Command):
   options = {}
   page_set = None
   test = timeline_based_measurement.TimelineBasedMeasurement
+  SUPPORTED_PLATFORMS = [expectations.ALL]
 
   def __init__(self, max_failures=None):
     """Creates a new Benchmark.
@@ -82,6 +83,16 @@ class Benchmark(command_line.Command):
     # See https://github.com/catapult-project/catapult/issues/3708
 
 
+  def CanRunOnPlatform(self, platform, finder_options):

[nednguyen, 2017/08/18 23:46:53]

If this is not supposed to be overridden, can you rename it with
_CanRunPlatform?

[rnephew (Reviews Here), 2017/08/21 16:30:32]

Done.

+    for p in self.SUPPORTED_PLATFORMS:
+      # This is reusing StoryExpectation code, so it is a bit unintuitive. We
+      # are trying to detect the opposite of the usual case in StoryExpectations
+      # so we want to return True when ShouldDisable returns true, even though
+      # we do not want to disable.
+      if p.ShouldDisable(platform, finder_options):
+        return True
+    return False
+
   # pylint: disable=unused-argument
   @classmethod
   def ShouldDisable(cls, possible_browser):