Add IORef capability to GrSurfaceProxy objects - take 2

Add IORef capability to GrSurfaceProxy objects - take 2

Re-landing of https://skia-review.googlesource.com/c/4734/ (Add IORef capability to GrSurfaceProxy objects) with fixes for:
 platforms that don't support discards.
 memory leak due to copying over of GrSurfaceProxy's creation ref to instantiated GrSurface in instantiate() 

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4827
BUG=skia:

Change-Id: If0b695d5cafc5ef3fdd251c38262849d09e5d27f
Committed: https://skia.googlesource.com/skia/+/1125a030c726854f94fd2b8eed49d1323fc1d038

[robertphillips, 2016-11-16 15:39:33]

Description was changed from

==========
Add IORef capability to GrSurfaceProxy objects - take 2

Re-landing of https://skia-review.googlesource.com/c/4734/ (Add IORef capability
to GrSurfaceProxy objects) with a fix for platforms that don't support discards.

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4827
BUG=skia:

Change-Id: If0b695d5cafc5ef3fdd251c38262849d09e5d27f
==========

to

==========
Add IORef capability to GrSurfaceProxy objects - take 2

Re-landing of https://skia-review.googlesource.com/c/4734/ (Add IORef capability
to GrSurfaceProxy objects) with fixes for:
 platforms that don't support discards.
 memory leak due to copying over of GrSurfaceProxy's creation ref to
instantiated GrSurface in instantiate() 

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4827
BUG=skia:

Change-Id: If0b695d5cafc5ef3fdd251c38262849d09e5d27f
==========

[robertphillips, 2016-11-16 15:39:33]

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

[robertphillips, 2016-11-16 15:39:52]

The CQ bit was checked by robertphillips@google.com to run a CQ dry run

[commit-bot: I haz the power, 2016-11-16 15:40:01]

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

[bsalomon, 2016-11-16 16:11:22]

lgtm

[commit-bot: I haz the power, 2016-11-16 16:12:48]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-11-16 16:12:49]

Dry run: This issue passed the CQ dry run.

[robertphillips, 2016-11-16 16:18:04]

The CQ bit was checked by robertphillips@google.com

[commit-bot: I haz the power, 2016-11-16 16:18:09]

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, 2016-11-16 19:17:21]

Description was changed from

==========
Add IORef capability to GrSurfaceProxy objects - take 2

Re-landing of https://skia-review.googlesource.com/c/4734/ (Add IORef capability
to GrSurfaceProxy objects) with fixes for:
 platforms that don't support discards.
 memory leak due to copying over of GrSurfaceProxy's creation ref to
instantiated GrSurface in instantiate() 

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4827
BUG=skia:

Change-Id: If0b695d5cafc5ef3fdd251c38262849d09e5d27f
==========

to

==========
Add IORef capability to GrSurfaceProxy objects - take 2

Re-landing of https://skia-review.googlesource.com/c/4734/ (Add IORef capability
to GrSurfaceProxy objects) with fixes for:
 platforms that don't support discards.
 memory leak due to copying over of GrSurfaceProxy's creation ref to
instantiated GrSurface in instantiate() 

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4827
BUG=skia:

Change-Id: If0b695d5cafc5ef3fdd251c38262849d09e5d27f
Committed:
https://skia.googlesource.com/skia/+/1125a030c726854f94fd2b8eed49d1323fc1d038
==========

[commit-bot: I haz the power, 2016-11-16 19:17:22]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/1125a030c726854f94fd2b8eed49d1323fc1d038