Remove GrPrimitiveType from GrMesh

Change-Id: I9b5bdaa08f3a383ce24d33aca5448352d954d9c1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/270001
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
41 files changed