Merge ShaderMode and FilterLogic enums in GrTextureEffect

Change-Id: I2523b79e6cf5654daba03aa837d05a76d8ca9f66
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/297189
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
2 files changed