GrTextureDomain: Go back to doing vector impl when modes are the same

Doing it using scalars all the time caused a mysterious shader compilation
issue on Chromecast. In the past we've had similar problems for long shaders.

Change-Id: Ied667c1d4ae47fb4ae9eee62421a7ad52eecebba
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/258880
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed