Add compression to Mock backend

Bring the Mock backend up to speed since we're expanding compression support.

Bug: skia:9680
Change-Id: I7fd7bed9351d3534d238feca0add54eced31cb4b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/259099
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/GrProxyProvider.cpp b/src/gpu/GrProxyProvider.cpp
index ba2f7e9..0f192a5 100644
--- a/src/gpu/GrProxyProvider.cpp
+++ b/src/gpu/GrProxyProvider.cpp
@@ -487,7 +487,7 @@
         sk_sp<SkData> data) {
 
     GrSurfaceDesc desc;
-    desc.fConfig = GrCompressionTypePixelConfig(compressionType);
+    desc.fConfig = GrCompressionTypeToPixelConfig(compressionType);
     desc.fWidth = width;
     desc.fHeight = height;