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/samplecode/SampleBigGradient.cpp b/samplecode/SampleBigGradient.cpp
index c921c37..dbfc332 100644
--- a/samplecode/SampleBigGradient.cpp
+++ b/samplecode/SampleBigGradient.cpp
@@ -1,4 +1,4 @@
-/*
+/*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
@@ -13,7 +13,7 @@
 static sk_sp<SkShader> make_grad(SkScalar w, SkScalar h) {
     SkColor colors[] = { 0xFF000000, 0xFF333333 };
     SkPoint pts[] = { { 0, 0 }, { w, h } };
-    return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
+    return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp);
 }
 
 class BigGradientView : public Sample {