Set correct mip map status on GrTexture since we no longer require all mip data

Bug: skia:
Change-Id: I5074028f307187eef3201523cbd1ddc7d9bf9013
Reviewed-on: https://skia-review.googlesource.com/54102
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
18 files changed