Move memoization of multisample specs id to GrRenderTarget

Move memoization of multisample specs id to GrRenderTarget

GrGpu used to perform the memoization on behalf of GrRenderTarget via
a public accessor. This change updates GrRenderTarget to do its own
work.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2467593002

Committed: https://skia.googlesource.com/skia/+/c25c5d73e9f4d840dc758c399496d5690709ad58

[csmartdalton, 2016-10-31 20:13:21]

Description was changed from

==========
Move memoization of multisample specs id to GrRenderTarget

GrGpu used to perform the memoization on behalf of GrRenderTarget via
a public accessor. This change updates GrRenderTarget to do its own
work.

BUG=skia:
==========

to

==========
Move memoization of multisample specs id to GrRenderTarget

GrGpu used to perform the memoization on behalf of GrRenderTarget via
a public accessor. This change updates GrRenderTarget to do its own
work.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2467593002
==========

[csmartdalton, 2016-10-31 20:17:27]

csmartdalton@google.com changed reviewers:
+ bsalomon@google.com, robertphillips@google.com

[bsalomon, 2016-11-01 13:16:04]

lgtm

[robertphillips, 2016-11-01 13:23:16]

lgtm

[csmartdalton, 2016-11-01 13:43:20]

The CQ bit was checked by csmartdalton@google.com

[commit-bot: I haz the power, 2016-11-01 13:43:29]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-11-01 14:04:01]

Description was changed from

==========
Move memoization of multisample specs id to GrRenderTarget

GrGpu used to perform the memoization on behalf of GrRenderTarget via
a public accessor. This change updates GrRenderTarget to do its own
work.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2467593002
==========

to

==========
Move memoization of multisample specs id to GrRenderTarget

GrGpu used to perform the memoization on behalf of GrRenderTarget via
a public accessor. This change updates GrRenderTarget to do its own
work.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2467593002

Committed:
https://skia.googlesource.com/skia/+/c25c5d73e9f4d840dc758c399496d5690709ad58
==========

[commit-bot: I haz the power, 2016-11-01 14:04:02]

Committed patchset #3 (id:40001) as
https://skia.googlesource.com/skia/+/c25c5d73e9f4d840dc758c399496d5690709ad58