Initialize glGen* call id args to zero

Initialize glGen* call id args to zero

Initialize glGenTexture, glGenBuffer call id buffer items to zero before
calls. Otherwise it's not easy to check if the call succeeded or not.

Assert the rule in debug gl context.

Make TesselatingPathRendererTests use debug gl context. It exercises
some of the GenBuffers call sites.

Committed: https://skia.googlesource.com/skia/+/546eb5c57aebee47172f9d2a3eae6b49945dba08

[Kimmo Kinnunen, 2015-12-10 09:11:37]

kkinnunen@nvidia.com changed reviewers:
+ bsalomon@google.com

[bsalomon, 2015-12-10 15:13:35]

lgtm

[Kimmo Kinnunen, 2015-12-11 07:51:35]

The CQ bit was checked by kkinnunen@nvidia.com

[commit-bot: I haz the power, 2015-12-11 07:51:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1514033002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1514033002/1

[commit-bot: I haz the power, 2015-12-11 08:05:38]

Description was changed from

==========
Initialize glGen* call id args to zero

Initialize glGenTexture, glGenBuffer call id buffer items to zero before
calls. Otherwise it's not easy to check if the call succeeded or not.

Assert the rule in debug gl context.

Make TesselatingPathRendererTests use debug gl context. It exercises
some of the GenBuffers call sites.
==========

to

==========
Initialize glGen* call id args to zero

Initialize glGenTexture, glGenBuffer call id buffer items to zero before
calls. Otherwise it's not easy to check if the call succeeded or not.

Assert the rule in debug gl context.

Make TesselatingPathRendererTests use debug gl context. It exercises
some of the GenBuffers call sites.

Committed:
https://skia.googlesource.com/skia/+/546eb5c57aebee47172f9d2a3eae6b49945dba08
==========

[commit-bot: I haz the power, 2015-12-11 08:05:38]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/546eb5c57aebee47172f9d2a3eae6b49945dba08