Double down on abandoned being publicly accessible on contexts

abandoned() is publicly accessible on GrContext. Since
GrRecordingContext is taking its place in many locations, make its
abandoned() call also publicly accessible.

This CL also removes abandoned() from GrContextPriv since it is
publicly accessible.

Change-Id: I72bdae369d06e34ec3f99a18a0feb72e2ae67666
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/299876
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Adlai Holler <adlai@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
18 files changed