Use GrSurfaceProxyView for dst proxies.

Bug: skia:9556
Change-Id: I41ae112a3d22f6c6481cba1afc3937b5e5115cf5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/252043
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/GrSurfaceContext.h b/src/gpu/GrSurfaceContext.h
index b30e531..29e5d7f 100644
--- a/src/gpu/GrSurfaceContext.h
+++ b/src/gpu/GrSurfaceContext.h
@@ -40,6 +40,7 @@
 
     const GrColorInfo& colorInfo() const { return fColorInfo; }
     GrSurfaceOrigin origin() const { return fOrigin; }
+    const GrSwizzle& textureSwizzle() const { return fTextureSwizzle; }
     GrSurfaceProxyView textureSurfaceView() {
         return { this->asSurfaceProxyRef(), fOrigin, fTextureSwizzle };
     }