Switch SkMagnifierImageFilter over to new onFilterImage interface

include/effects/SkMagnifierImageFilter.h

Index: include/effects/SkMagnifierImageFilter.h
diff --git a/include/effects/SkMagnifierImageFilter.h b/include/effects/SkMagnifierImageFilter.h
index 739f1eec733167df3df5806de464918218c01a8f..6e20297ff4a6066f47701ece8509743648737d03 100644
--- a/include/effects/SkMagnifierImageFilter.h
+++ b/include/effects/SkMagnifierImageFilter.h
@@ -14,7 +14,9 @@
 
 class SK_API SkMagnifierImageFilter : public SkImageFilter {
 public:
-    static sk_sp<SkImageFilter> Make(const SkRect& src, SkScalar inset, sk_sp<SkImageFilter> input);
+    static sk_sp<SkImageFilter> Make(const SkRect& src, SkScalar inset,
+                                     sk_sp<SkImageFilter> input,

[Stephen White, 2016/04/13 21:23:23]

<soapbox> Not new to this patch, but personally I think it's unfortunate that
we've made the input param non-optional to all the Make() functions. Not so much
for Chrome, where we always pass it, but for Skia as an API, for users who "just
want a blurred circle" for example and are forced to understand the DAG a bit to
do it and pepper their code with nullptr. </soapbox>

+                                     const CropRect* cropRect = nullptr);
 
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkMagnifierImageFilter)
@@ -27,15 +29,14 @@ public:
 #endif
 
 protected:
-    SkMagnifierImageFilter(const SkRect& srcRect, SkScalar inset, sk_sp<SkImageFilter> input);
+    SkMagnifierImageFilter(const SkRect& srcRect,
+                           SkScalar inset,
+                           sk_sp<SkImageFilter> input,
+                           const CropRect* cropRect);
     void flatten(SkWriteBuffer&) const override;
 
-    bool onFilterImageDeprecated(Proxy*, const SkBitmap& src, const Context&,
-                                 SkBitmap* result, SkIPoint* offset) const override;
-#if SK_SUPPORT_GPU
-    bool asFragmentProcessor(GrFragmentProcessor**, GrTexture*, const SkMatrix&,
-                             const SkIRect& bounds) const override;
-#endif
+    sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* source, const Context&,
+                                        SkIPoint* offset) const override;
 
 private:
     SkRect fSrcRect;