Demote savePixels to save_pixels

This CL again only really makes sense in the bigger picture of moving readPixels off of GrTexture

Change-Id: Ib76482d8a773144e8fc7c6e55b2c7fa7b3ea0ecf
Reviewed-on: https://skia-review.googlesource.com/6086
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
7 files changed