Set MaxDrawBuffers to 1 if WEBGL_draw_buffers is not enabled in WebGL.

Set MaxDrawBuffers to 1 if WEBGL_draw_buffers is not enabled in WebGL.

BUG=
TEST=webgl conformance tests
R=bajones@chromium.org, kbr@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=221316

[Zhenyao Mo, 2013-09-04 22:20:53]

This is a minor fix.  I updated the WEBGL_draw_buffers spec recently per
discussion with kbr, so now chrome should follow the spec.

Please take a look.

[bajones, 2013-09-04 22:26:54]

lgtm

[Ken Russell (switch to Gerrit), 2013-09-04 22:35:22]

Is there already a test which verifies this behavior?

[Zhenyao Mo, 2013-09-04 22:37:49]

On 2013/09/04 22:35:22, Ken Russell wrote:
> Is there already a test which verifies this behavior?

Yes, a webgl conformance test covers this behavior.  Was red before, was green
with this CL.

[Ken Russell (switch to Gerrit), 2013-09-04 22:39:54]

OK, thanks. LGTM

[commit-bot: I haz the power, 2013-09-04 22:46:48]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/zmo@chromium.org/23464034/1

[commit-bot: I haz the power, 2013-09-04 23:11:06]

Sorry for I got bad news for ya.
Compile failed with a clobber build on ios_dbg_simulator.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=ios_dbg_si...
Your code is likely broken or HEAD is junk. Please ensure your
code is not broken then alert the build sheriffs.
Look at the try server FAQ for more details.

[Zhenyao Mo, 2013-09-05 00:15:08]

Committed patchset #1 manually as r221316 (presubmit successful).