Reduce dependence on GrSurface's origin field (take 3)

TBR=bsalomon@google.com

Change-Id: I8c95c6774897dbd87e3c5c87d92f75c5b64d4e76
Reviewed-on: https://skia-review.googlesource.com/26424
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/GrBackendTextureImageGenerator.cpp b/src/gpu/GrBackendTextureImageGenerator.cpp
index dac8168..3de6fec 100644
--- a/src/gpu/GrBackendTextureImageGenerator.cpp
+++ b/src/gpu/GrBackendTextureImageGenerator.cpp
@@ -165,7 +165,7 @@
 
     SkASSERT(fRefHelper->fBorrowingContextID == context->uniqueID());
 
-    sk_sp<GrTextureProxy> proxy = GrSurfaceProxy::MakeWrapped(std::move(tex));
+    sk_sp<GrTextureProxy> proxy = GrSurfaceProxy::MakeWrapped(std::move(tex), fSurfaceOrigin);
 
     if (0 == origin.fX && 0 == origin.fY &&
         info.width() == fBackendTexture.width() && info.height() == fBackendTexture.height()) {