Reland of Disable smoothness.top_25_smooth on win/mac/linux. (patchset #1 id:1 of https://codereview.chromium.org/1245483002/)
Reland of Disable smoothness.top_25_smooth on win/mac/linux. (patchset #1 id:1 of https://codereview.chromium.org/1245483002/)

Reason for revert:
Disabling the test smoothness.top_25_smooth on win/mac/linux again.

The test is still causing perf bot failure.

Original issue's description:
> Revert of Disable smoothness.top_25_smooth on win/mac/linux. (patchset #1 id:1 of https://codereview.chromium.org/1238073003/)
>
> Reason for revert:
> This was caused by https://codereview.chromium.org/1234223003, which has been reverted.
>
> BUG=510818
>
> Original issue's description:
> > Disable smoothness.top_25_smooth on win/mac/linux.
> >
> > BUG=510818
> >
> > Committed: https://crrev.com/d143ef088ec1069825eb9a585d82be3b4ccc9ce6
> > Cr-Commit-Position: refs/heads/master@{#339041}
>
> TBR=sullivan@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=510818
>
> Committed: https://crrev.com/9e04ff6e861e62e2023c1f74fe1a479356e78e73
> Cr-Commit-Position: refs/heads/master@{#339259}

TBR=sullivan@chromium.org,simonhatch@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=510818

Review URL: https://codereview.chromium.org/1241483003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#339306}

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