Revert of Revert of Revert of Disable WebGL conformance test on Win8/NVIDIA

Revert of Revert of Revert of Disable WebGL conformance test on Win8/NVIDIA (patchset #1 id:1 of https://codereview.chromium.org/1082203004/)

Reason for revert:
The windows test time has been cut in half and shouldn't time out anymore.

Original issue's description:
> Revert of Revert of Disable WebGL conformance test on Win8/NVIDIA (patchset #1 id:1 of https://codereview.chromium.org/1085073002/)
>
> Reason for revert:
> Still very flaky on Win Nvidia:
>
> http://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=webgl_conformance_tests&tests=WebglConformance.conformance_textures_tex_image_and_sub_image_2d_with_array_buffer_view
>
> Original issue's description:
> > Revert of Disable WebGL conformance test on Win8/NVIDIA (patchset #3 id:40001 of https://codereview.chromium.org/930423002/)
> >
> > Reason for revert:
> > kbr@ doesn't think this is needed anymore, and it might be a cause of us missing real issues.  I'll try reverting it, and keep an eye on it.
> >
> > Original issue's description:
> > > Disable WebGL conformance test on Win8/NVIDIA
> > >
> > > The test:
> > > conformance_textures_tex_image_and_sub_image_2d_with_array_buffer_view
> > >
> > > Has been timing out on and off for as long as we have records.
> > >
> > > BUG=459265
> > >
> > > Committed: https://crrev.com/777a126ec7c9fbd50c4f62b27de648e5b306fc7d
> > > Cr-Commit-Position: refs/heads/master@{#316872}
> >
> > TBR=zmo@chromium.org,ccameron@chromium.org
> > BUG=459265
> >
> > Committed: https://crrev.com/997ea6c612de165623240c058f9e4e89ced7f702
> > Cr-Commit-Position: refs/heads/master@{#325142}
>
> TBR=zmo@chromium.org,ccameron@chromium.org,hendrikw@chromium.org
> BUG=459265
>
> Committed: https://crrev.com/c29d5c5f8d7ae90012a3d6bd42218b860cb53558
> Cr-Commit-Position: refs/heads/master@{#325435}

TBR=zmo@chromium.org,ccameron@chromium.org,johnme@chromium.org
BUG=459265
Committed: https://crrev.com/6e99cf838b13dd8386a5751fb2cc12ac171aadf9
Cr-Commit-Position: refs/heads/master@{#326400}

[hendrikw, 2015-04-21 23:04:46]

Created Revert of Revert of Revert of Disable WebGL conformance test on
Win8/NVIDIA

[Zhenyao Mo, 2015-04-22 20:48:17]

LGTM

[hendrikw, 2015-04-22 20:48:36]

The CQ bit was checked by hendrikw@chromium.org

[commit-bot: I haz the power, 2015-04-22 20:52:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1099203003/1

[commit-bot: I haz the power, 2015-04-22 23:37:57]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-22 23:38:54]

Patchset 1 (id:??) landed as
https://crrev.com/6e99cf838b13dd8386a5751fb2cc12ac171aadf9
Cr-Commit-Position: refs/heads/master@{#326400}