Revert of Rename enums in GrContextFactory to remove "GL"

Revert of Rename enums in GrContextFactory to remove "GL" (patchset #4 id:60001 of https://codereview.chromium.org/1845923004/ )

Reason for revert:
Many GM images unexpectedly changed with this CL.

Original issue's description:
> Rename enums in GrContextFactory to remove "GL"
> 
> Also, remove kNative as a separate context type and instead make it an alias for kGL or kGLES based on OS.
> 
> 
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1845923004
> 
> Committed: https://skia.googlesource.com/skia/+/2d9c6f81353597aebf5934547e5cba7a872196fb

TBR=egdaniel@google.com,jvanverth@google.com
# Not skipping CQ checks because original CL landed more than 1 days ago.

Committed: https://skia.googlesource.com/skia/+/b4b4cf36c66900fdfaf63106d54a8fac786a3313

[bsalomon, 2016-04-04 12:37:41]

Created Revert of Rename enums in GrContextFactory to remove "GL"

[commit-bot: I haz the power, 2016-04-04 12:37:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1856703002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1856703002/1

[commit-bot: I haz the power, 2016-04-04 12:57:02]

Description was changed from

==========
Revert of Rename enums in GrContextFactory to remove "GL" (patchset #4 id:60001
of https://codereview.chromium.org/1845923004/ )

Reason for revert:
Many GM images unexpectedly changed with this CL.

Original issue's description:
> Rename enums in GrContextFactory to remove "GL"
> 
> Also, remove kNative as a separate context type and instead make it an alias
for kGL or kGLES based on OS.
> 
> 
> GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
> 
> Committed:
https://skia.googlesource.com/skia/+/2d9c6f81353597aebf5934547e5cba7a872196fb

TBR=egdaniel@google.com,jvanverth@google.com
# Not skipping CQ checks because original CL landed more than 1 days ago.
==========

to

==========
Revert of Rename enums in GrContextFactory to remove "GL" (patchset #4 id:60001
of https://codereview.chromium.org/1845923004/ )

Reason for revert:
Many GM images unexpectedly changed with this CL.

Original issue's description:
> Rename enums in GrContextFactory to remove "GL"
> 
> Also, remove kNative as a separate context type and instead make it an alias
for kGL or kGLES based on OS.
> 
> 
> GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
> 
> Committed:
https://skia.googlesource.com/skia/+/2d9c6f81353597aebf5934547e5cba7a872196fb

TBR=egdaniel@google.com,jvanverth@google.com
# Not skipping CQ checks because original CL landed more than 1 days ago.

Committed:
https://skia.googlesource.com/skia/+/b4b4cf36c66900fdfaf63106d54a8fac786a3313
==========

[commit-bot: I haz the power, 2016-04-04 12:57:03]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/b4b4cf36c66900fdfaf63106d54a8fac786a3313