Switch SkSpecialImage & SkSpecialSurface classes over to smart pointers

gm/offsetimagefilter.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "sk_tool_utils.h"
 #include "SkImage.h"
 #include "SkImageSource.h"
@@ skipping 29 matching lines @@
                                                       sk_tool_utils::color_to_565(0xFFA0A0A0),
                                                       sk_tool_utils::color_to_565(0xFF404040),
                                                       8));
     }
 
     void onDraw(SkCanvas* canvas) override {
         canvas->clear(SK_ColorBLACK);
         SkPaint paint;
 
         for (int i = 0; i < 4; i++) {
-            const SkImage* image = (i & 0x01) ? fCheckerboard.get() : fBitmap.get();
+            SkImage* image = (i & 0x01) ? fCheckerboard.get() : fBitmap.get();
             SkIRect cropRect = SkIRect::MakeXYWH(i * 12,
                                                  i * 8,
                                                  image->width() - i * 8,
                                                  image->height() - i * 12);
             SkImageFilter::CropRect rect(SkRect::Make(cropRect));
             SkAutoTUnref<SkImageFilter> tileInput(SkImageSource::Create(image));
             SkScalar dx = SkIntToScalar(i*5);
             SkScalar dy = SkIntToScalar(i*10);
             SkAutoTUnref<SkImageFilter> filter(SkOffsetImageFilter::Create(dx, dy, tileInput,
                                                                            &rect));
@@ skipping 137 matching lines @@
 
         // crop==clip==dst
         canvas->translate(100, 0);
         this->doDraw(canvas, r, SkOffsetImageFilter::Create(40, 0, nullptr, &cr2), &r2);
     }
 
 private:
     typedef skiagm::GM INHERITED;
 };
 DEF_GM( return new SimpleOffsetImageFilterGM; )