Add GLSL support for texelFetch

Add GLSL support for texelFetch

Adds a cap and builder methods for texelFetch. This is required for
texel buffers. Also moves the texel buffer cap into the general shader
caps, and adds glTexBufferRange to the GL interface.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1869063005

Committed: https://skia.googlesource.com/skia/+/f8a6ce8d8c54cab5456d3099fa07e460c889c2e6

[Chris Dalton, 2016-04-08 00:08:24]

Description was changed from

==========
Add GLSL support for texelFetch

Adds a cap and builder methods for texelFetch. This is required for
texel buffers. Also moves the texel buffer cap into the general shader
caps, and adds glTexBufferRange to the GL interface.

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

to

==========
Add GLSL support for texelFetch

Adds a cap and builder methods for texelFetch. This is required for
texel buffers. Also moves the texel buffer cap into the general shader
caps, and adds glTexBufferRange to the GL interface.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

[Chris Dalton, 2016-04-08 00:25:39]

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

[bsalomon, 2016-04-11 19:51:30]

lgtm

[Chris Dalton, 2016-04-11 19:51:57]

The CQ bit was checked by cdalton@nvidia.com

[commit-bot: I haz the power, 2016-04-11 19:52:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1869063005/80001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1869063005/80001

[commit-bot: I haz the power, 2016-04-11 20:02:08]

Description was changed from

==========
Add GLSL support for texelFetch

Adds a cap and builder methods for texelFetch. This is required for
texel buffers. Also moves the texel buffer cap into the general shader
caps, and adds glTexBufferRange to the GL interface.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

to

==========
Add GLSL support for texelFetch

Adds a cap and builder methods for texelFetch. This is required for
texel buffers. Also moves the texel buffer cap into the general shader
caps, and adds glTexBufferRange to the GL interface.

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/+/f8a6ce8d8c54cab5456d3099fa07e460c889c2e6
==========

[commit-bot: I haz the power, 2016-04-11 20:02:08]

Committed patchset #5 (id:80001) as
https://skia.googlesource.com/skia/+/f8a6ce8d8c54cab5456d3099fa07e460c889c2e6