Dawn: implement GrBackendTexture::isSameTexture().

Bug: skia:10345
Change-Id: Iae15dd92f6f488dce1fb1afe9728be1b0996270c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/295084
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Stephen White <senorblanco@chromium.org>
1 file changed