Make color initialization version of createBackendTexture public

Mechanical.

Change-Id: I48be78a12684fc5243ee509e391984daa190fb7d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/218182
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/tools/gpu/ProxyUtils.cpp b/tools/gpu/ProxyUtils.cpp
index d89bba2..9483088 100644
--- a/tools/gpu/ProxyUtils.cpp
+++ b/tools/gpu/ProxyUtils.cpp
@@ -34,7 +34,7 @@
     sk_sp<GrTextureProxy> proxy;
     if (kBottomLeft_GrSurfaceOrigin == origin) {
         // We (soon will) only support using kBottomLeft with wrapped textures.
-        auto backendTex = context->priv().createBackendTexture(
+        auto backendTex = context->createBackendTexture(
                 width, height, format, SkColors::kTransparent, GrMipMapped::kNo, renderable);
         if (!backendTex.isValid()) {
             return nullptr;