Remove GrProxyPendingIO

Change-Id: I9cf40f0518673206c6304e3f386dd75c9a44f269
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/235865
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/GrXferProcessor.h b/src/gpu/GrXferProcessor.h
index 604c68d..18525e7 100644
--- a/src/gpu/GrXferProcessor.h
+++ b/src/gpu/GrXferProcessor.h
@@ -87,6 +87,7 @@
         void setOffset(int ox, int oy) { fOffset.set(ox, oy); }
 
         GrTextureProxy* proxy() const { return fProxy.get(); }
+        sk_sp<GrTextureProxy> refProxy() const { return fProxy; }
 
         void setProxy(sk_sp<GrTextureProxy> proxy) {
             fProxy = std::move(proxy);