This prevents Chrome's about:gpu from being filled with bad shaders,
and instead only prints the relevant error lines.

BUG=None

Change-Id: I75fcd2ef920d2ed7b98e8668c487b0921faf4c0b
Reviewed-on: https://chromium-review.googlesource.com/513417Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>