start to hide textparams on SkPaint

Bug: skia:
Change-Id: Id73c983cc71d39fe587d355e690261627fa63aee
Reviewed-on: https://skia-review.googlesource.com/c/172643
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
8 files changed