Revert of Add OpenGL context to Viewer.

Revert of Add OpenGL context to Viewer. (patchset #7 id:120001 of https://codereview.chromium.org/1978573003/ )

Reason for revert:
sk_app/WindowContext.cpp is missing. Need to add file and resubmit.

Original issue's description:
> Add OpenGL context to Viewer.
> 
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1978573003
> 
> Committed: https://skia.googlesource.com/skia/+/56a11e4d6f3d436a3c2497c9c9e71a117d78a93f

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

Committed: https://skia.googlesource.com/skia/+/2884e9c0bd2cc9634a4b932d4142840c67227a78

[jvanverth1, 2016-05-18 14:01:04]

Created Revert of Add OpenGL context to Viewer.

[commit-bot: I haz the power, 2016-05-18 14:01:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1990893002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1990893002/1

[commit-bot: I haz the power, 2016-05-18 14:01:19]

Description was changed from

==========
Revert of Add OpenGL context to Viewer. (patchset #7 id:120001 of
https://codereview.chromium.org/1978573003/ )

Reason for revert:
sk_app/WindowContext.cpp is missing. Need to add file and resubmit.

Original issue's description:
> Add OpenGL context to Viewer.
> 
> BUG=skia:
> GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
> 
> Committed:
https://skia.googlesource.com/skia/+/56a11e4d6f3d436a3c2497c9c9e71a117d78a93f

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

to

==========
Revert of Add OpenGL context to Viewer. (patchset #7 id:120001 of
https://codereview.chromium.org/1978573003/ )

Reason for revert:
sk_app/WindowContext.cpp is missing. Need to add file and resubmit.

Original issue's description:
> Add OpenGL context to Viewer.
> 
> BUG=skia:
> GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
> 
> Committed:
https://skia.googlesource.com/skia/+/56a11e4d6f3d436a3c2497c9c9e71a117d78a93f

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

Committed:
https://skia.googlesource.com/skia/+/2884e9c0bd2cc9634a4b932d4142840c67227a78
==========

[commit-bot: I haz the power, 2016-05-18 14:01:20]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/2884e9c0bd2cc9634a4b932d4142840c67227a78