Add ES 3.0 fallback for instanced rendering

Add ES 3.0 fallback for instanced rendering

Adds the ability for GLInstancedRendering to use
glDrawElementsInstanced when glDrawElementsIndirect is not supported.

The only remaining 3.1 dependency now is EXT_texture_buffer.

Also moves the cap for glDraw*Instanced out of GrCaps and into
GrGLCaps.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2193303002

Committed: https://skia.googlesource.com/skia/+/4c18b62a004599d5a36ab7d772302dff2be91a3b

[csmartdalton, 2016-07-29 17:40:48]

Description was changed from

==========
Add ES 3.0 fallback for instanced rendering

Adds the ability for GLInstancedRendering to use
glDrawElementsInstanced when glDrawElementsIndirect is not supported.

The only remaining 3.1 dependency now is EXT_texture_buffer.

Also moves the cap for glDrawElementsInstanced out of GrCaps and into
GrGLCaps.

BUG=skia:
==========

to

==========
Add ES 3.0 fallback for instanced rendering

Adds the ability for GLInstancedRendering to use
glDrawElementsInstanced when glDrawElementsIndirect is not supported.

The only remaining 3.1 dependency now is EXT_texture_buffer.

Also moves the cap for glDrawElementsInstanced out of GrCaps and into
GrGLCaps.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2193303002
==========

[csmartdalton, 2016-07-29 17:43:25]

csmartdalton@google.com changed reviewers:
+ bsalomon@google.com

[csmartdalton, 2016-07-29 17:43:26]

This obviously isn't going to have test coverage on the bots  (at least in ES)
since if you have texture buffer,  you automatically also have glDraw*Indirect.
But it will be useful for the 3.0 command buffer.

[csmartdalton, 2016-07-29 17:44:15]

Description was changed from

==========
Add ES 3.0 fallback for instanced rendering

Adds the ability for GLInstancedRendering to use
glDrawElementsInstanced when glDrawElementsIndirect is not supported.

The only remaining 3.1 dependency now is EXT_texture_buffer.

Also moves the cap for glDrawElementsInstanced out of GrCaps and into
GrGLCaps.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2193303002
==========

to

==========
Add ES 3.0 fallback for instanced rendering

Adds the ability for GLInstancedRendering to use
glDrawElementsInstanced when glDrawElementsIndirect is not supported.

The only remaining 3.1 dependency now is EXT_texture_buffer.

Also moves the cap for glDraw*Instanced out of GrCaps and into
GrGLCaps.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2193303002
==========

[bsalomon, 2016-07-29 17:59:18]

lgtm

[csmartdalton, 2016-07-29 18:08:51]

The CQ bit was checked by csmartdalton@google.com

[commit-bot: I haz the power, 2016-07-29 18:08:59]

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, 2016-07-29 19:19:31]

Description was changed from

==========
Add ES 3.0 fallback for instanced rendering

Adds the ability for GLInstancedRendering to use
glDrawElementsInstanced when glDrawElementsIndirect is not supported.

The only remaining 3.1 dependency now is EXT_texture_buffer.

Also moves the cap for glDraw*Instanced out of GrCaps and into
GrGLCaps.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2193303002
==========

to

==========
Add ES 3.0 fallback for instanced rendering

Adds the ability for GLInstancedRendering to use
glDrawElementsInstanced when glDrawElementsIndirect is not supported.

The only remaining 3.1 dependency now is EXT_texture_buffer.

Also moves the cap for glDraw*Instanced out of GrCaps and into
GrGLCaps.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2193303002

Committed:
https://skia.googlesource.com/skia/+/4c18b62a004599d5a36ab7d772302dff2be91a3b
==========

[commit-bot: I haz the power, 2016-07-29 19:19:32]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/4c18b62a004599d5a36ab7d772302dff2be91a3b