Reland of "Finish conversion to sk_sp<SkShader> (patchset #2 id:20001 of https://codereview.chromiu…

samplecode/SampleClamp.cpp

Index: samplecode/SampleClamp.cpp
diff --git a/samplecode/SampleClamp.cpp b/samplecode/SampleClamp.cpp
index e319a56dc4f3d59f835a56536c0ce4b5cb945b17..97390535223324c83d8bf5246a954ff84897b8a7 100644
--- a/samplecode/SampleClamp.cpp
+++ b/samplecode/SampleClamp.cpp
@@ -13,25 +13,20 @@
 #include "SkGradientShader.h"
 #include "SkPicture.h"
 
-static SkShader* make_linear() {
+static sk_sp<SkShader> make_linear() {
     SkPoint pts[] = { 0, 0, SK_Scalar1/500, SK_Scalar1/500 };
     SkColor colors[] = { SK_ColorRED, SK_ColorBLUE };
-    return SkGradientShader::CreateLinear(pts, colors, nullptr, 2,
-                                          SkShader::kClamp_TileMode);
+    return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
 }
 
 class ClampView : public SampleView {
-    SkShader*   fGrad;
+    sk_sp<SkShader> fGrad;
 
 public:
     ClampView() {
         fGrad = make_linear();
     }
 
-    virtual ~ClampView() {
-        fGrad->unref();
-    }
-
 protected:
     // overrides from SkEventSink
     virtual bool onQuery(SkEvent* evt) {