[graphite] Add TextureProxyView class.

Bug: skia:12845
Change-Id: I2cf5074f85242f51b3798c59d4450c043a99afee
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/509916
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
3 files changed