Revert of Revert of Add logs to debug a flakiness on GPU Mac bots.

Revert of Revert of Add logs to debug a flakiness on GPU Mac bots. (patchset #1 id:1 of https://codereview.chromium.org/684253003/)

Reason for revert:
Ah, reverted the wrong CL.

Original issue's description:
> Revert of Add logs to debug a flakiness on GPU Mac bots. (patchset #2 id:20001 of https://codereview.chromium.org/684423005/)
>
> Reason for revert:
> Should turn on logging in telemetry_gpu_tests in general.
>
> Original issue's description:
> > Add logs to debug a flakiness on GPU Mac bots.
> >
> > This is temporary and will be removed after we pin down the issue.
> >
> > BUG=424024
> > TEST=
> > R=kbr@chromium.org
> > TBR=dgozman@chromium.org
> > NOTRY=true
> >
> > Committed: https://crrev.com/16aa242c3456dc68cd91ef2c683158799c8441b0
> > Cr-Commit-Position: refs/heads/master@{#302371}
>
> TBR=dgozman@chromium.org,kbr@chromium.org,pfeldman@chromium.org,yurys@chromium.org
> NOTREECHECKS=true
> NOTRY=true
> BUG=424024
>
> Committed: https://crrev.com/ec506e7f57922e5a068d76128f020877bc7986cb
> Cr-Commit-Position: refs/heads/master@{#302387}

TBR=dgozman@chromium.org,kbr@chromium.org,pfeldman@chromium.org,yurys@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=424024
Committed: https://crrev.com/ce1b1bf47b9a1f60d604a5f766a28e4948e598dc
Cr-Commit-Position: refs/heads/master@{#302388}

[Zhenyao Mo, 2014-11-01 16:24:52]

Created Revert of Revert of Add logs to debug a flakiness on GPU Mac bots.

[commit-bot: I haz the power, 2014-11-01 16:25:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/698783002/1

[commit-bot: I haz the power, 2014-11-01 16:25:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-01 16:26:44]

Patchset 1 (id:??) landed as
https://crrev.com/ce1b1bf47b9a1f60d604a5f766a28e4948e598dc
Cr-Commit-Position: refs/heads/master@{#302388}