Use TextureProxy size directly in GrYUVToRGBEffect FragmentProcessor

Instead of take extra input to indicate size for texture proxies of
different planes, directly use texture proxy's size.

Bug: skia:7903
Change-Id: I5d6c859510f7390948c6dcfbdd17343faa786aca
Reviewed-on: https://skia-review.googlesource.com/130964
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Weiliang Chen <weiliangc@chromium.org>
6 files changed