Implement refPinnedTextureProxy for SkImage_Lazy.

Creating a cross-context texture exposed a hole in our lazyproxy
texture generation. Despite having a wrapped texture we were falling
back to drawing in tiled mode, which is incorrect. Filling in these
methods allows us to draw with the wrapped texture.

Bug: skia:9562
Change-Id: Ia26c5d75b202aefdf720e6d1f7a201af23e40676
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/251214
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
3 files changed