Implement a basic setImage to TextureWgpu. Bug: angleproject:8457 Change-Id: I62d7996b0492aa5dccfbc95892b5edc5cc05b20d Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5392381 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Liza Burakova <liza@chromium.org> Reviewed-by: Matthew Denton <mpdenton@chromium.org>