Print GL shader source with line numbers when there is a compile error

BUG=skia:

Change-Id: I06bad4aacf5992d8207881f59f20615479536481
Reviewed-on: https://skia-review.googlesource.com/8562
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
1 file changed