Use SkTileMode instead of nested enum

Add guard to transition clients

Change-Id: Ia7a3e8f95722f91e84af262168dadf89a78707da
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/205720
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Auto-Submit: Mike Reed <reed@google.com>
diff --git a/gm/radial_gradient_precision.cpp b/gm/radial_gradient_precision.cpp
index f594afe..bb4e155 100644
--- a/gm/radial_gradient_precision.cpp
+++ b/gm/radial_gradient_precision.cpp
@@ -17,6 +17,6 @@
     SkPaint p;
     p.setShader(SkGradientShader::MakeRadial(center, radius,
                                              colors, nullptr, SK_ARRAY_COUNT(colors),
-                                             SkShader::kRepeat_TileMode));
+                                             SkTileMode::kRepeat));
     canvas->drawPaint(p);
 }