Don't elide GrMatrixEffect if matrix is identity.

This ensures an effect setup code path that calls GrMatrix::Make()
doesn't produce an identity and non-identity shader variant.

Change-Id: I4d17395ed1b5bfd2bf9ceac68e85756c18eb2d2f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/396018
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed