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>
diff --git a/src/gpu/GrResourceCache.h b/src/gpu/GrResourceCache.h
index 7730ebd..59141ad 100644
--- a/src/gpu/GrResourceCache.h
+++ b/src/gpu/GrResourceCache.h
@@ -225,7 +225,7 @@
             if (resource->resourcePriv().refsWrappedObjects()) {
                 ++fWrapped;
             }
-            if (SkBudgeted::kNo  == resource->resourcePriv().isBudgeted()) {
+            if (GrBudgetedType::kBudgeted != resource->resourcePriv().budgetedType()) {
                 fUnbudgetedSize += resource->gpuMemorySize();
             }
         }