Switch SkImageSource image filter over to new onFilterImage interface

tests/SpecialImageTest.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 "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkImage.h"
@@ skipping 90 matching lines @@
     test_image(img, reporter, true, false);
 }
 
 DEF_TEST(SpecialImage_Image, reporter) {
     SkBitmap bm = create_bm();
 
     SkAutoTUnref<SkImage> fullImage(SkImage::NewFromBitmap(bm));
 
     const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);
 
-    SkAutoTUnref<SkSpecialImage> img(SkSpecialImage::NewFromImage(subset, fullImage));
+    SkAutoTUnref<SkSpecialImage> img(SkSpecialImage::NewFromImage(nullptr, subset, fullImage));
     test_image(img, reporter, true, false);
 }
 
 #if SK_SUPPORT_GPU
 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialImage_Gpu, reporter, context) {
     SkBitmap bm = create_bm();
 
     GrSurfaceDesc desc;
     desc.fConfig = kSkia8888_GrPixelConfig;
     desc.fFlags  = kNone_GrSurfaceFlags;
     desc.fWidth  = kFullSize;
     desc.fHeight = kFullSize;
 
     SkAutoTUnref<GrTexture> texture(context->textureProvider()->createTexture(desc, SkBudgeted::kNo,
                                                                               bm.getPixels(), 0));
     if (!texture) {
         return;
     }
 
     const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);
 
     SkAutoTUnref<SkSpecialImage> img(SkSpecialImage::NewFromGpu(nullptr, subset, 
                                                                 kNeedNewImageUniqueID_SpecialImage,
                                                                 texture));
     test_image(img, reporter, false, true);
 }
 
 #endif