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This is a reland of 50136be2

Disabling the test on non-Android. We only care about this on Android at
the moment. linux-trusty-rel also seems to fail on sched_setaffinity,
likely a limitation of the host.

Original change's description:
> Reland "base: Add API to restrict thread affinity to little cores on Android"
>
> This is a reland of 027aa92e
>
> Relanding but disabling test on CrOS devices (some of our CrOS devices
> seem to have asymmetric CPUs that aren't covered by the test).
>
> Original change's description:
> > base: Add API to restrict thread affinity to little cores on Android
> >
> > Adds functions that facilitate setting the CPU affinity of a given
> > thread or process to all little cores on the system.
> >
> > We intend to use this API to run a power experiment.
> >
> > Bug: 1111789
> > Change-Id: I6c3d32c2338e9f00464e8b6a8c96af93658a3ae2
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335176
> > Commit-Queue: Eric Seckler <eseckler@chromium.org>
> > Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> > Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#794998}
>
> TBR: dcheng@chromium.org
> Bug: 1111789
> Change-Id: I59315ec0e9a1727986278a04fa5bde409143dfb5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339416
> Reviewed-by: Eric Seckler <eseckler@chromium.org>
> Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
> Auto-Submit: Eric Seckler <eseckler@chromium.org>
> Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
> Commit-Queue: Eric Seckler <eseckler@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#795126}

TBR: dcheng@chromium.org
Bug: 1111789
Change-Id: I0c9770f2e0c7d5b8caba9432e55c5f3ebe198322
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339342Reviewed-by: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Auto-Submit: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795396}