Metal: Use the context device to Texture::resize Makes the resized texture to be attributed to the owner. Bug: angleproject:6832 Change-Id: Ia1eae1bb6c9e83e23fae51121f88d9ce37dc948b Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3347642 Reviewed-by: John Cunningham <johncunningham@apple.com> Reviewed-by: Kenneth Russell <kbr@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>