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This patch adds support for enabling/disabling individual stories on individual
platforms using the same approaches as for benchmarks:

  1. Disabled/Enabled decorator:

     @decorators.Disabled('win')
     class Story(system_health_story.SystemHealthStory):
        ...

  2. ShouldDisable method:

     class Story(system_health_story.SystemHealthStory):
        ...

        @classmethod
        def ShouldDisable(cls, possible_browser):
          return possible_browser.platform.GetOSName() == 'win'

Note that this patch also enables search:portal:google on all desktop
platforms except for Windows.

BUG=634331
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.perf:android_s5_perf_cq;master.tryserver.chromium.perf:linux_perf_cq;master.tryserver.chromium.perf:mac_retina_perf_cq;master.tryserver.chromium.perf:winx64_10_perf_cq

Review-Url: https://codereview.chromium.org/2228103002
Cr-Commit-Position: refs/heads/master@{#417552}