sk_sp for gpu.

include/gpu/GrTypesPriv.h

Index: include/gpu/GrTypesPriv.h
diff --git a/include/gpu/GrTypesPriv.h b/include/gpu/GrTypesPriv.h
index 6a6fd54c7ba5488b2bbfd19eb7c9a3350fe93a41..8c7d6bda65150b6cd055a235f136077f4897c008 100644
--- a/include/gpu/GrTypesPriv.h
+++ b/include/gpu/GrTypesPriv.h
@@ -10,6 +10,7 @@
 
 #include "GrTypes.h"
 #include "SkRect.h"
+#include "SkRefCnt.h"
 
  /**
   * Types of shader-language-specific boxed variables we can create. (Currently only GrGLShaderVars,
@@ -476,4 +477,9 @@ enum class GrBackendObjectOwnership : bool {
     kOwned = true
 };
 
+template <typename T> T * const * sk_sp_address_as_pointer_address(sk_sp<T> const * sp) {
+    static_assert(sizeof(T*) == sizeof(sk_sp<T>), "sk_sp not expected size.");
+    return reinterpret_cast<T * const *>(sp);
+}
+
 #endif