Revert of Enable sRGB on iOS, make sRGB decode support optional

Revert of Enable sRGB on iOS, make sRGB decode support optional (patchset #11 id:200001 of https://codereview.chromium.org/2539993002/ )

Reason for revert:
ANGLE tests are failing

Original issue's description:
> Two (related) changes here:
> 
> 1) Our older iOS devices failed our sRGB tests, due to precision issues
> with alpha. At this point, we only test on iPadMini 4, and that appears
> not to have any problems.
> 
> 2) iOS devices still don't have the sRGB texture decode extension. But,
> some clients have no interest in mixing legacy/color-correct rendering,
> and would like to use sRGB on these devices. This GrContextOptions flag
> enables sRGB support in those cases.
> 
> Adjust the test code to produce sRGB capable contexts on these devices,
> but only for configs that have a color space. (See comment).
> 
> BUG=skia:4148
> 
> Committed: https://skia.googlesource.com/skia/+/9db12d2341f3f8722c8b90b11dd4cce138a8a64e

TBR=bsalomon@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4148
Committed: https://skia.googlesource.com/skia/+/0a2782c98c45127a10d6392c539e7bce72dc5513

[Brian Osman, 2016-12-01 18:41:47]

The CQ bit was checked by brianosman@google.com

[Brian Osman, 2016-12-01 18:41:47]

Created Revert of Enable sRGB on iOS, make sRGB decode support optional

[commit-bot: I haz the power, 2016-12-01 18:41:58]

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, 2016-12-01 18:42:04]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1480617707511830, "parent_rev":
"dd19ac7d10c7c00dd6e9b1f4c4c6aae729c7e6d4", "commit_rev":
"0a2782c98c45127a10d6392c539e7bce72dc5513"}

[commit-bot: I haz the power, 2016-12-01 18:42:10]

Description was changed from

==========
Revert of Enable sRGB on iOS, make sRGB decode support optional (patchset #11
id:200001 of https://codereview.chromium.org/2539993002/ )

Reason for revert:
ANGLE tests are failing

Original issue's description:
> Two (related) changes here:
> 
> 1) Our older iOS devices failed our sRGB tests, due to precision issues
> with alpha. At this point, we only test on iPadMini 4, and that appears
> not to have any problems.
> 
> 2) iOS devices still don't have the sRGB texture decode extension. But,
> some clients have no interest in mixing legacy/color-correct rendering,
> and would like to use sRGB on these devices. This GrContextOptions flag
> enables sRGB support in those cases.
> 
> Adjust the test code to produce sRGB capable contexts on these devices,
> but only for configs that have a color space. (See comment).
> 
> BUG=skia:4148
> 
> Committed:
https://skia.googlesource.com/skia/+/9db12d2341f3f8722c8b90b11dd4cce138a8a64e

TBR=bsalomon@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4148
==========

to

==========
Revert of Enable sRGB on iOS, make sRGB decode support optional (patchset #11
id:200001 of https://codereview.chromium.org/2539993002/ )

Reason for revert:
ANGLE tests are failing

Original issue's description:
> Two (related) changes here:
> 
> 1) Our older iOS devices failed our sRGB tests, due to precision issues
> with alpha. At this point, we only test on iPadMini 4, and that appears
> not to have any problems.
> 
> 2) iOS devices still don't have the sRGB texture decode extension. But,
> some clients have no interest in mixing legacy/color-correct rendering,
> and would like to use sRGB on these devices. This GrContextOptions flag
> enables sRGB support in those cases.
> 
> Adjust the test code to produce sRGB capable contexts on these devices,
> but only for configs that have a color space. (See comment).
> 
> BUG=skia:4148
> 
> Committed:
https://skia.googlesource.com/skia/+/9db12d2341f3f8722c8b90b11dd4cce138a8a64e

TBR=bsalomon@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4148

Committed:
https://skia.googlesource.com/skia/+/0a2782c98c45127a10d6392c539e7bce72dc5513
==========

[commit-bot: I haz the power, 2016-12-01 18:42:11]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/0a2782c98c45127a10d6392c539e7bce72dc5513