VulkanWindowContext uses sample-able swap VkImages when available.

MSAA now requires this.

Removes last use of SkSurface::MakeFromBackendTextureAsRenderTarget.

Bug: skia:9832
Change-Id: I2837aa0dd9e2cc999c5aac194816777bca477abe
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/324889
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
2 files changed