Move all non-AA fill rect ops off of GrLegacyMeshDrawOp.

Move all non-AA fill rect ops off of GrLegacyMeshDrawOp.

This adds perspective to GrNewNonAAFillRectOp, renames it to GrNonAAFillRectOp, and deletes the previous version of that namespace.

Change-Id: I20f35bf019f9c9105e6ec83dda11328451138109
Reviewed-on: https://skia-review.googlesource.com/15634
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>