Update SkMergeImageFilter to sk_sp

gm/imagefiltersbase.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkCanvas.h"
 #include "SkColorFilter.h"
@@ skipping 73 matching lines @@
     }
 
 private:
     typedef SkImageFilter INHERITED;
 };
 
 static IdentityImageFilter::Registrar gReg1;
 
 SkFlattenable* IdentityImageFilter::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
-    return IdentityImageFilter::Create(common.getInput(0));
+    return IdentityImageFilter::Create(common.getInput(0).get());
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void IdentityImageFilter::toString(SkString* str) const {
     str->appendf("IdentityImageFilter: (");
     str->append(")");
 }
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////
@@ skipping 210 matching lines @@
 
 class ImageFiltersText_CF : public ImageFiltersTextBaseGM {
 public:
     ImageFiltersText_CF() : ImageFiltersTextBaseGM("color") {}
 
     void installFilter(SkPaint* paint) override {
         paint->setColorFilter(SkColorFilter::MakeModeFilter(SK_ColorBLUE, SkXfermode::kSrcIn_Mode));
     }
 };
 DEF_GM( return new ImageFiltersText_CF; )