more shader-->sp conversions

gm/imagetoyuvplanes.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include <SkSurface.h>
 #include "gm.h"
@@ skipping 10 matching lines @@
         surface.reset(SkSurface::NewRaster(info));
     }
     if (!surface) {
         return nullptr;
     }
     // Create an RGB image from which we will extract planes
     SkPaint paint;
     static const SkColor kColors[] =
             { SK_ColorBLUE, SK_ColorYELLOW, SK_ColorGREEN, SK_ColorWHITE };
     SkScalar r = (width + height) / 4.f;
-    paint.setShader(SkGradientShader::CreateRadial(SkPoint::Make(0,0), r, kColors,
-                                                   nullptr, SK_ARRAY_COUNT(kColors),
-                                                   SkShader::kMirror_TileMode))->unref();
+    paint.setShader(SkGradientShader::MakeRadial(SkPoint::Make(0,0), r, kColors,
+                                                 nullptr, SK_ARRAY_COUNT(kColors),
+                                                 SkShader::kMirror_TileMode));
 
     surface->getCanvas()->drawPaint(paint);
     return surface->newImageSnapshot();
 }
 
 DEF_SIMPLE_GM(image_to_yuv_planes, canvas, 120, 525) {
     static const SkScalar kPad = 5.f;
     static const int kImageSize = 32;
 
     GrContext *context = canvas->getGrContext();
@@ skipping 58 matching lines @@
                 for (int i = 0; i < 3; ++i) {
                     canvas->drawBitmap(yuvBmps[i], x, y);
                     y += kPad + yuvBmps[i].height();
                 }
             }
         }
 
         x += rgbImage->width() + kPad;
     }
 }