sk_spification of GrGpu creation.

Make GrContext::MakeGL take interface as sk_sp.

Make GrContext::MakeVulkan take GrVkBackendContext as sk_sp.

Change-Id: I13c22a57bd281c51738f503d9ed3418d35a466df
Reviewed-on: https://skia-review.googlesource.com/81842
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/example/SkiaSDLExample.cpp b/example/SkiaSDLExample.cpp
index 3878cc7..ab181cb 100644
--- a/example/SkiaSDLExample.cpp
+++ b/example/SkiaSDLExample.cpp
@@ -192,7 +192,7 @@
     sk_sp<const GrGLInterface> interface(GrGLCreateNativeInterface());
 
     // setup contexts
-    sk_sp<GrContext> grContext(GrContext::MakeGL(interface.get()));
+    sk_sp<GrContext> grContext(GrContext::MakeGL(interface));
     SkASSERT(grContext);
 
     // Wrap the frame buffer object attached to the screen in a Skia render target so Skia can