Reland of Disable smoothness.top_25_smooth on win/mac/linux.

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
Committed: https://crrev.com/27caabde676d75984390e355ebe185bea501b020
Cr-Commit-Position: refs/heads/master@{#339306}

[majidvp, 2015-07-17 19:45:28]

Created Reland of Disable smoothness.top_25_smooth on win/mac/linux.

[commit-bot: I haz the power, 2015-07-17 19:46:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1241483003/1

[commit-bot: I haz the power, 2015-07-17 19:49:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-17 19:51:25]

Patchset 1 (id:??) landed as
https://crrev.com/27caabde676d75984390e355ebe185bea501b020
Cr-Commit-Position: refs/heads/master@{#339306}