Update SkImageSource to sk_sp

gm/imagesource2.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkImage.h"
 #include "SkImageSource.h"
@@ skipping 42 matching lines @@
             p.setColor(gColors[curColor]);
             canvas->drawRect(r, p);
 
             curColor = (curColor+1) % SK_ARRAY_COUNT(gColors);
         }
 
         fImage = surface->makeImageSnapshot();
     }
 
     void onDraw(SkCanvas* canvas) override {
-        SkRect srcRect = SkRect::MakeLTRB(0, 0,
-                                          SkIntToScalar(kImageSize), SkIntToScalar(kImageSize));
-        SkRect dstRect = SkRect::MakeLTRB(0.75f, 0.75f, 225.75f, 225.75f);
-
-        SkAutoTUnref<SkImageFilter> filter(
-            SkImageSource::Create(fImage.get(), srcRect, dstRect, fFilter));
+        const SkRect srcRect = SkRect::MakeLTRB(0, 0,
+                                                SkIntToScalar(kImageSize),
+                                                SkIntToScalar(kImageSize));
+        const SkRect dstRect = SkRect::MakeLTRB(0.75f, 0.75f, 225.75f, 225.75f);
 
         SkPaint p;
-        p.setImageFilter(filter);
+        p.setImageFilter(SkImageSource::Make(fImage, srcRect, dstRect, fFilter));
 
         canvas->saveLayer(nullptr, &p);
         canvas->restore();
     }
 
 private:
     static const int kImageSize = 503;
 
     SkString fSuffix;
     SkFilterQuality fFilter;
     sk_sp<SkImage>  fImage;
 
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new ImageSourceGM("none", kNone_SkFilterQuality);)
 DEF_GM(return new ImageSourceGM("low", kLow_SkFilterQuality);)
 DEF_GM(return new ImageSourceGM("med", kMedium_SkFilterQuality);)
 DEF_GM(return new ImageSourceGM("high", kHigh_SkFilterQuality);)
 }