Revert of Revert of Turn on NVPR 4x MSAA by default when supported in DM and nanobench.

Revert of Revert of Turn on NVPR 4x MSAA by default when supported in DM and nanobench. (patchset #1 id:1 of https://codereview.chromium.org/693933004/)

Reason for revert:
Try again with loops overflow fix landed.

Original issue's description:
> Revert of Turn on NVPR 4x MSAA by default when supported in DM and nanobench. (patchset #2 id:20001 of https://codereview.chromium.org/704563003/)
> 
> Reason for revert:
> Timing out on nvpr when drawing conics. Fix will take some thought so reverting for now.
> 
> Original issue's description:
> > Turn on NVPR 4x MSAA by default when supported in DM and nanobench.
> > 
> > This brings DM and nanobench's default configs in line with GM's.
> > 
> > BUG=skia:
> > 
> > Committed: https://skia.googlesource.com/skia/+/31f88675718966bbb7f09718b40de10c7e214739
> 
> TBR=bsalomon@google.com,mtklein@google.com,mtklein@chromium.org
> NOTREECHECKS=true
> NOTRY=true
> BUG=skia:
> 
> Committed: https://skia.googlesource.com/skia/+/d5cd4ee5b81b51e43be7ed13f3c0f0f6c1b3fe14

TBR=bsalomon@google.com,mtklein@chromium.org,egdaniel@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/2ecf86e55ecb893cf4d04e16a4ac5b0de6dcf173

[mtklein, 2014-11-06 16:06:12]

Created Revert of Revert of Turn on NVPR 4x MSAA by default when supported in DM
and nanobench.

[commit-bot: I haz the power, 2014-11-06 16:06:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/685923003/1

[commit-bot: I haz the power, 2014-11-06 16:06:43]

Committed patchset #1 (id:1) as 2ecf86e55ecb893cf4d04e16a4ac5b0de6dcf173