Update SkMergeImageFilter to sk_sp

include/core/SkImageFilter.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkImageFilter_DEFINED
 #define SkImageFilter_DEFINED
 
@@ skipping 275 matching lines @@
                                   const SkBitmap& src, const Context&,
                                   SkBitmap* result, SkIPoint* offset) const;
 #endif
 
     SK_TO_STRING_PUREVIRT()
     SK_DEFINE_FLATTENABLE_TYPE(SkImageFilter)
 
 protected:
     class Common {
     public:
-        Common() {}
-        ~Common();
-
         /**
          *  Attempt to unflatten the cropRect and the expected number of input filters.
          *  If any number of input filters is valid, pass -1.
          *  If this fails (i.e. corrupt buffer or contents) then return false and common will
          *  be left uninitialized.
          *  If this returns true, then inputCount() is the number of found input filters, each
          *  of which may be NULL or a valid imagefilter.
          */
         bool unflatten(SkReadBuffer&, int expectedInputs);
 
         const CropRect& cropRect() const { return fCropRect; }
         int             inputCount() const { return fInputs.count(); }
-        SkImageFilter** inputs() const { return fInputs.get(); }
+        sk_sp<SkImageFilter>* inputs() const { return fInputs.get(); }
 
-        SkImageFilter*  getInput(int index) const { return fInputs[index]; }
+        sk_sp<SkImageFilter>  getInput(int index) const { return fInputs[index]; }
 
         // If the caller wants a copy of the inputs, call this and it will transfer ownership
         // of the unflattened input filters to the caller. This is just a short-cut for copying
         // the inputs, calling ref() on each, and then waiting for Common's destructor to call
         // unref() on each.
         void detachInputs(SkImageFilter** inputs);
 
     private:
         CropRect fCropRect;
         // most filters accept at most 2 input-filters
-        SkAutoSTArray<2, SkImageFilter*> fInputs;
+        SkAutoSTArray<2, sk_sp<SkImageFilter>> fInputs;
 
         void allocInputs(int count);
     };
 
     SkImageFilter(int inputCount, SkImageFilter** inputs, const CropRect* cropRect = nullptr);
 
     SkImageFilter(sk_sp<SkImageFilter>* inputs, int inputCount, const CropRect* cropRect);
 
     virtual ~SkImageFilter();
 
@@ skipping 150 matching lines @@
  */
 #define SK_IMAGEFILTER_UNFLATTEN_COMMON(localVar, expectedCount)    \
     Common localVar;                                                \
     do {                                                            \
         if (!localVar.unflatten(buffer, expectedCount)) {           \
             return NULL;                                            \
         }                                                           \
     } while (0)
 
 #endif