Add "meshCount" to GrProgramInfo

This improves the encapsulation of the GrProgramInfo class.

Bug: skia:9455
Change-Id: Ic241ba4a2c2edea3e774522065371e5ed8cc2da3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/247438
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
15 files changed