Mark wrapped textures imported into SkImages as "read only".

Read only textures and proxies fail writePixels, as copy dsts, and mip
regeneration.

Bug: skia:8509

Change-Id: Iaa0b473cc9a9930fde3ef0e91373d5040650de35
Reviewed-on: https://skia-review.googlesource.com/c/174316
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/tests/RectangleTextureTest.cpp b/tests/RectangleTextureTest.cpp
index 21a9e19..dc1d3b7 100644
--- a/tests/RectangleTextureTest.cpp
+++ b/tests/RectangleTextureTest.cpp
@@ -135,7 +135,8 @@
             }
         }
 
-        sk_sp<GrTextureProxy> rectProxy = proxyProvider->wrapBackendTexture(rectangleTex, origin);
+        sk_sp<GrTextureProxy> rectProxy = proxyProvider->wrapBackendTexture(
+                rectangleTex, origin, kBorrow_GrWrapOwnership, kRW_GrIOType);
 
         if (!rectProxy) {
             ERRORF(reporter, "Error creating proxy for rectangle texture.");