Add GrContext API to allow updating GrBackendSurfaceMutableState.

This is currently only supported for the Vulkan backend

Bug: skia:10254
Change-Id: I9274799098dc00dec5abcbcec95ce7cc23fec537
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/293844
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
9 files changed