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GrBackendObject is deprecated and going away in Skia so switch to its
replacement: GrBackendTexture.

This does rely on the following Skia CL having rolled into Chrome:
    https://skia-review.googlesource.com/c/skia/+/82823 (Update SkImage::MakeFromYUVTexturesCopy to GrBackendTexture)

Change-Id: I3a6445ac44d4799ce6f4d10d1ff19cda6743f955
Reviewed-on: https://chromium-review.googlesource.com/824563Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Brian Salomon <bsalomon@chromium.org>
Commit-Queue: Robert Phillips <robertphillips@google.com>
Cr-Commit-Position: refs/heads/master@{#524128}