Use enum to track MipMapsStatus throughout Texture creation

Bug: skia:
Change-Id: I1de1105d74b45f7b02ff52e6b8333801d98ef1ce
Reviewed-on: https://skia-review.googlesource.com/58501
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
22 files changed