Replace bool purgeImmediately with enum GrWrapCacheable.

Store budgeted status as a tri-state enum on GrGpuResource:
kBudgeted
kUnbudgetedCacheable
kUnbudgetedUncacheable

Uncacheable vs. Cacheable captures the current distinction between
wrapped resources created with purgeImmediately or !purgeImmediately.

Non-wrapped and unbudgeted resources are all kUnbudgetedCacheable to
match current behavior.

This change just introduces the new types. No behavior is changed.

Bug: chromium:922851

Change-Id: Ic2387bf321cf9b56b4c9ffd9dbef8ade60f9cb98
Reviewed-on: https://skia-review.googlesource.com/c/185003
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
36 files changed