use Make instead of Create to return a shared shader

samplecode/SampleLayers.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 "SkView.h"
 #include "SkCanvas.h"
 #include "SkBlurMaskFilter.h"
 #include "SkCamera.h"
 #include "SkColorFilter.h"
 #include "SkColorPriv.h"
 #include "SkDevice.h"
 #include "SkGradientShader.h"
 #include "SkImageDecoder.h"
 #include "SkInterpolator.h"
 #include "SkMaskFilter.h"
 #include "SkPath.h"
 #include "SkRegion.h"
 #include "SkShader.h"
 #include "SkTime.h"
 #include "SkTypeface.h"
 #include "SkUtils.h"
 #include "SkKey.h"
 #include "SkXfermode.h"
 #include "SkDrawFilter.h"
 
 static void make_paint(SkPaint* paint, const SkMatrix& localMatrix) {
     SkColor colors[] = { 0, SK_ColorWHITE };
     SkPoint pts[] = { { 0, 0 }, { 0, SK_Scalar1*20 } };
-    SkShader* s = SkGradientShader::CreateLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode,
-                                                 0, &localMatrix);
-
-    paint->setShader(s)->unref();
+    paint->setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2,
+                                                  SkShader::kClamp_TileMode, 0, &localMatrix));
     paint->setXfermodeMode(SkXfermode::kDstIn_Mode);
 }
 
 static void dump_layers(const char label[], SkCanvas* canvas) {
     SkDebugf("Dump Layers(%s)\n", label);
 
     SkCanvas::LayerIter iter(canvas, true);
     int index = 0;
     while (!iter.done()) {
         SkImageInfo info = iter.device()->imageInfo();
@@ skipping 255 matching lines @@
         this->inval(nullptr);
         fCenter = click->fCurr;
         return this->INHERITED::onClick(click);
     }
 
 private:
     typedef SampleView INHERITED;
 };
 DEF_SAMPLE( return new BackdropView; )