Moving SkBlurImageFilter into core

include/effects/SkBlurImageFilter.h

 /*
  * Copyright 2011 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkBlurImageFilter_DEFINED
 #define SkBlurImageFilter_DEFINED
 
 #include "SkImageFilter.h"
-#include "SkSize.h"
 
-class SK_API SkBlurImageFilter : public SkImageFilter {
+class SK_API SkBlurImageFilter {
 public:
     static sk_sp<SkImageFilter> Make(SkScalar sigmaX, SkScalar sigmaY,
                                      sk_sp<SkImageFilter> input,
-                                     const CropRect* cropRect = nullptr);
-
-    SkRect computeFastBounds(const SkRect&) const override;
-
-    SK_TO_STRING_OVERRIDE()
-    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkBlurImageFilter)
+                                     const SkImageFilter::CropRect* cropRect = nullptr) {
+        return SkImageFilter::MakeBlur(sigmaX, sigmaY, input, cropRect);
+    }
 
 #ifdef SK_SUPPORT_LEGACY_IMAGEFILTER_PTR
-    static SkImageFilter* Create(SkScalar sigmaX, SkScalar sigmaY, SkImageFilter* input = nullptr,
-                                 const CropRect* cropRect = nullptr) {
-        return Make(sigmaX, sigmaY, sk_ref_sp<SkImageFilter>(input), cropRect).release();
+    static SkImageFilter* Create(SkScalar sigmaX, SkScalar sigmaY,
+                                 SkImageFilter * input = nullptr,
+                                 const SkImageFilter::CropRect* cropRect = nullptr) {
+        return SkImageFilter::MakeBlur(sigmaX, sigmaY, sk_ref_sp<SkImageFilter>(input),
+                                       cropRect).release();
     }
 #endif
-
-protected:
-    void flatten(SkWriteBuffer&) const override;
-    sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* source, const Context&,
-                                        SkIPoint* offset) const override;
-    SkIRect onFilterNodeBounds(const SkIRect& src, const SkMatrix&, MapDirection) const override;
-
-private:
-    SkBlurImageFilter(SkScalar sigmaX,
-                      SkScalar sigmaY,
-                      sk_sp<SkImageFilter> input,
-                      const CropRect* cropRect);
-
-    SkSize   fSigma;
-    typedef SkImageFilter INHERITED;
 };
 
 #endif