Update DropShadowImageFilter to sk_sp

include/effects/SkDropShadowImageFilter.h

Index: include/effects/SkDropShadowImageFilter.h
diff --git a/include/effects/SkDropShadowImageFilter.h b/include/effects/SkDropShadowImageFilter.h
index 7f1aa332208c62a79e1849c6fb1759fe12d0da36..a4726f3247f8207b78c5bf157de375034d9a3c1b 100644
--- a/include/effects/SkDropShadowImageFilter.h
+++ b/include/effects/SkDropShadowImageFilter.h
@@ -23,17 +23,30 @@ public:
 
     static const int kShadowModeCount = kLast_ShadowMode+1;
 
-    static SkImageFilter* Create(SkScalar dx, SkScalar dy, SkScalar sigmaX, SkScalar sigmaY,
-                                 SkColor color, ShadowMode shadowMode, SkImageFilter* input = NULL,
-                                 const CropRect* cropRect = NULL) {
-        return new SkDropShadowImageFilter(dx, dy, sigmaX, sigmaY, color, shadowMode, input,
-                                           cropRect);
+    static sk_sp<SkImageFilter> Make(SkScalar dx, SkScalar dy, SkScalar sigmaX, SkScalar sigmaY,
+                                     SkColor color, ShadowMode shadowMode,
+                                     sk_sp<SkImageFilter> input,
+                                     const CropRect* cropRect = nullptr) {
+        return sk_sp<SkImageFilter>(new SkDropShadowImageFilter(dx, dy, sigmaX, sigmaY, 
+                                                                color, shadowMode,
+                                                                std::move(input),
+                                                                cropRect));
     }
 
     SkRect computeFastBounds(const SkRect&) const override;
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDropShadowImageFilter)
 
+#ifdef SK_SUPPORT_LEGACY_IMAGEFILTER_PTR
+    static SkImageFilter* Create(SkScalar dx, SkScalar dy, SkScalar sigmaX, SkScalar sigmaY,
+                                 SkColor color, ShadowMode shadowMode,
+                                 SkImageFilter* input = nullptr,
+                                 const CropRect* cropRect = nullptr) {
+        return Make(dx, dy, sigmaX, sigmaY, color, shadowMode,
+                    sk_ref_sp<SkImageFilter>(input), cropRect).release();
+    }
+#endif
+
 protected:
     void flatten(SkWriteBuffer&) const override;
     sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* source, const Context&,
@@ -42,7 +55,8 @@ protected:
 
 private:
     SkDropShadowImageFilter(SkScalar dx, SkScalar dy, SkScalar sigmaX, SkScalar sigmaY, SkColor,
-                            ShadowMode shadowMode, SkImageFilter* input, const CropRect* cropRect);
+                            ShadowMode shadowMode, sk_sp<SkImageFilter> input,
+                            const CropRect* cropRect);
 
     SkScalar fDx, fDy, fSigmaX, fSigmaY;
     SkColor fColor;