Make rest of GrGpu::wrapBackend* methods take a GrColorType (take 2)

This CL is intended to further wean Ganesh off of using the GrBackendTexture's pixel config

TBR=bsalomon@google.com
Bug: skia:6718
Change-Id: Iedaa7811f9c4aac552f219c702627bc476325317
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/228338
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
50 files changed