Use GrGLenum consistently for cached program binaryFormat

Change-Id: I43f8b9fb580ab4d3a7e41cf43dd2a6b6a232376b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/206178
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed