Pass the writeView as a const-ref instead of a pointer …

The important part is in GrOpFlushState.h were previously
we were taking a mutable pointer to the view, which should
at least be a const pointer and was making us do funky things
in some of the calling code. But I decided to go all the way
and do a const ref instead which is The Way It Should Be (tm).

Change-Id: I399d102e8b5e0a5059168cc450ae66f12ad47e13
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/336451
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Adlai Holler <adlai@google.com>
diff --git a/tools/gpu/ProxyUtils.h b/tools/gpu/ProxyUtils.h
index 84277a4..278f0c9 100644
--- a/tools/gpu/ProxyUtils.h
+++ b/tools/gpu/ProxyUtils.h
@@ -28,7 +28,7 @@
 
 GrProgramInfo* CreateProgramInfo(const GrCaps*,
                                  SkArenaAlloc*,
-                                 const GrSurfaceProxyView* writeView,
+                                 const GrSurfaceProxyView& writeView,
                                  GrAppliedClip&&,
                                  const GrXferProcessor::DstProxyView&,
                                  GrGeometryProcessor*,