Only run GL congs on CCPR bots

Bug: skia:
Change-Id: Ief012869b740bbfb947a77c91c4478a851f2517e
Reviewed-on: https://skia-review.googlesource.com/25062
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
3 files changed