Potentially fix definition of GR_TEST_UTILS in gn_to_bp.py

TBR=scroggo@google.com

Change-Id: I0afe43855e7ac55a0f6a9b88af16a1d7b36666a2
Reviewed-on: https://skia-review.googlesource.com/21737
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed