More info gathering on dirty mipmap textures

Bug: chromium:1365578
Change-Id: I399ffff2a4e0308ed9e7a9d195efb5ef0f0f24ae
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/594810
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
4 files changed