Move a bunch of internal types from GrTypes to GrTypesPriv

Change-Id: I9fe1297ae7d185957c76681305bcf22cc972e53b
Reviewed-on: https://skia-review.googlesource.com/116189
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
7 files changed