Switch from querying swizzle on caps to using swizzles stored on proxies.

Change-Id: I03f4a3affd6dda7a83bee8eec768dcaa93a6b801
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/220534
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
diff --git a/src/gpu/GrSurfaceContext.cpp b/src/gpu/GrSurfaceContext.cpp
index c12cc2e..b2ca779 100644
--- a/src/gpu/GrSurfaceContext.cpp
+++ b/src/gpu/GrSurfaceContext.cpp
@@ -548,6 +548,7 @@
 
     SkASSERT(src->backendFormat().textureType() != GrTextureType::kExternal);
     SkASSERT(src->origin() == this->asSurfaceProxy()->origin());
+    SkASSERT(src->config() == this->asSurfaceProxy()->config());
 
     GrSurfaceProxy* dst = this->asSurfaceProxy();