Generate identical shader keys for X and Y blurs when there is no domain

This mirrors the logic in emitCode, and avoids extra shader compiles.

Change-Id: I2c11e082dfa2b9fc673dc2b8fdf2f0b964407b90
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/227777
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
1 file changed