Revert of Explicit control in tools of ANGLE frontend and backend

Revert of Explicit control in tools of ANGLE frontend and backend (patchset #6 id:90001 of https://codereview.chromium.org/2381033002/ )

Reason for revert:
Broke bots

Original issue's description:
> Explicit control in tools of ANGLE frontend and backend
> 
> Update the ANGLE test GL context, GrContextFactory, and config parsing to allow explicit control of ANGLE front/backend.
> 
> This will allow us to explicitly test ES2 vs ES3 interfaces to ANGLE as well as D3D9, D3D11, and OpenGL backends.
> 
> Also makes the angle api types valid in all builds (but will just fail when SK_ANGLE=1 or not on windows for the d3d backends).
> 
> BUG=skia:5804
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2381033002
> 
> Committed: https://skia.googlesource.com/skia/+/50094fb489543655df026be4e4f99e09e57a1f49

TBR=brianosman@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:5804
Committed: https://skia.googlesource.com/skia/+/7c2213ba61c61ab76117019f95705639e2f01de8

[bsalomon, 2016-09-29 17:07:10]

The CQ bit was checked by bsalomon@google.com

[bsalomon, 2016-09-29 17:07:10]

Created Revert of Explicit control in tools of ANGLE frontend and backend

[commit-bot: I haz the power, 2016-09-29 17:07:13]

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, 2016-09-29 17:07:24]

Description was changed from

==========
Revert of Explicit control in tools of ANGLE frontend and backend (patchset #6
id:90001 of https://codereview.chromium.org/2381033002/ )

Reason for revert:
Broke bots

Original issue's description:
> Explicit control in tools of ANGLE frontend and backend
> 
> Update the ANGLE test GL context, GrContextFactory, and config parsing to
allow explicit control of ANGLE front/backend.
> 
> This will allow us to explicitly test ES2 vs ES3 interfaces to ANGLE as well
as D3D9, D3D11, and OpenGL backends.
> 
> Also makes the angle api types valid in all builds (but will just fail when
SK_ANGLE=1 or not on windows for the d3d backends).
> 
> BUG=skia:5804
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2381033002
> 
> Committed:
https://skia.googlesource.com/skia/+/50094fb489543655df026be4e4f99e09e57a1f49

TBR=brianosman@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:5804
==========

to

==========
Revert of Explicit control in tools of ANGLE frontend and backend (patchset #6
id:90001 of https://codereview.chromium.org/2381033002/ )

Reason for revert:
Broke bots

Original issue's description:
> Explicit control in tools of ANGLE frontend and backend
> 
> Update the ANGLE test GL context, GrContextFactory, and config parsing to
allow explicit control of ANGLE front/backend.
> 
> This will allow us to explicitly test ES2 vs ES3 interfaces to ANGLE as well
as D3D9, D3D11, and OpenGL backends.
> 
> Also makes the angle api types valid in all builds (but will just fail when
SK_ANGLE=1 or not on windows for the d3d backends).
> 
> BUG=skia:5804
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2381033002
> 
> Committed:
https://skia.googlesource.com/skia/+/50094fb489543655df026be4e4f99e09e57a1f49

TBR=brianosman@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:5804

Committed:
https://skia.googlesource.com/skia/+/7c2213ba61c61ab76117019f95705639e2f01de8
==========

[commit-bot: I haz the power, 2016-09-29 17:07:25]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/7c2213ba61c61ab76117019f95705639e2f01de8