Remove compressed format support from the GrGpu::createBackendTexture code path

The intent is to add a createCompressedBackendTexture code path. This will decouple the GPU's ability to create compressed textures from raster's support for compressed SkColorTypes.

Change-Id: I5fa5dded6d5013b524fe7f99f2ebe0bdee76b3c4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/243657
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
6 files changed