print on unused uniforms in debug builds

print on unused uniforms in debug builds

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/af2d56d2139cc5597a5a43a4e16acbd8d10e9060

[joshualitt, 2015-05-08 21:42:07]

joshualitt@google.com changed reviewers:
+ bsalomon@google.com, joshualitt@google.com, robertphillips@google.com

[joshualitt, 2015-05-08 21:42:08]

ignore the earlier CL, after talking with Brian I'm just going to change the
assert to a print.  It'd be easy enough to put a breakpoint on the line if you
wanted.

[robertphillips, 2015-05-11 11:43:51]

lgtm

[robertphillips, 2015-05-11 11:43:57]

The CQ bit was checked by robertphillips@google.com to run a CQ dry run

[commit-bot: I haz the power, 2015-05-11 11:44:02]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1136803002/40001

[commit-bot: I haz the power, 2015-05-11 11:50:25]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-05-11 11:50:26]

Dry run: This issue passed the CQ dry run.

[joshualitt, 2015-05-11 13:21:15]

The CQ bit was checked by joshualitt@google.com

[commit-bot: I haz the power, 2015-05-11 13:21:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1136803002/40001

[commit-bot: I haz the power, 2015-05-11 13:21:38]

Committed patchset #3 (id:40001) as
https://skia.googlesource.com/skia/+/af2d56d2139cc5597a5a43a4e16acbd8d10e9060