Rename GLRTFBOIDIs0 to WrapsSwapchainSurface and use for Metal.

This provides a way to indicate that a Metal RenderTarget, and in
particular a RenderTargetProxy, is framebufferOnly, so it can be
restricted to certain operations.

Bug: skia:9573
TBR: bsalomon@google.com
Change-Id: I733fae2fce402c375534889346255afe28a57944
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/255783
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
14 files changed