use Make instead of Create to return a shared shader

samplecode/SampleDegenerateTwoPtRadials.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SampleCode.h"
 #include "SkAnimTimer.h"
 #include "SkView.h"
 #include "SkCanvas.h"
 #include "SkGradientShader.h"
 #include "SkString.h"
 
 static void draw_gradient2(SkCanvas* canvas, const SkRect& rect, SkScalar delta) {
     SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorMAGENTA };
     SkScalar pos[] = { 0, 0.25f, 0.75f, SK_Scalar1 };
 
     SkScalar l = rect.fLeft;
     SkScalar t = rect.fTop;
     SkScalar w = rect.width();
     SkScalar h = rect.height();
 
     SkASSERT(0 == SkScalarMod(w, SK_Scalar1 * 5));
 
     SkPoint c0 = { l + 2 * w / 5 + delta, t + h / 2 };
     SkPoint c1 = { l + 3 * w / 5, t + h / 2 };
     SkScalar r0 = w / 5;
     SkScalar r1 = 2 * w / 5;
-    SkShader* s = SkGradientShader::CreateTwoPointConical(c0, r0, c1, r1, colors,
-                                                         pos, SK_ARRAY_COUNT(pos),
-                                                         SkShader::kClamp_TileMode);
     SkPaint paint;
-    paint.setShader(s)->unref();
-
+    paint.setShader(SkGradientShader::MakeTwoPointConical(c0, r0, c1, r1, colors,
+                                                          pos, SK_ARRAY_COUNT(pos),
+                                                          SkShader::kClamp_TileMode));
     canvas->drawRect(rect, paint);
 }
 
 
 class DegenerateTwoPtRadialsView : public SampleView {
 public:
     DegenerateTwoPtRadialsView() {
         fTime = 0;
         this->setBGColor(0xFFDDDDDD);
     }
@@ skipping 38 matching lines @@
 
 private:
     SkScalar           fTime;
     typedef SampleView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new DegenerateTwoPtRadialsView; }
 static SkViewRegister reg(MyFactory);