Update SkImage::MakeFromYUVTexturesCopy to GrBackendTexture

Change-Id: I7ba030c5d7856309709e892a2b1b625cf74c70b8
Reviewed-on: https://skia-review.googlesource.com/82823
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
14 files changed