Add option to LazyYUVImage to build mip maps

Fixes unexpected image changes to ducky_yuv_blend after
https://skia-review.googlesource.com/c/skia/+/306360

Change-Id: Ic517075883b301c3645059005c6f5d7417872c48
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/307016
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
3 files changed