Outline SkImageFilter Make methods

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 {
 public:
-    static sk_sp<SkImageFilter> Make(SkScalar sigmaX, SkScalar sigmaY, sk_sp<SkImageFilter> input,
-                                     const CropRect* cropRect = nullptr) {
-        if (0 == sigmaX && 0 == sigmaY && nullptr == cropRect) {
-            return input;
-        }
-        return sk_sp<SkImageFilter>(new SkBlurImageFilter(sigmaX, sigmaY, input, cropRect));
-    }
+    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)
 
 #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();
@@ skipping 10 matching lines @@
     SkBlurImageFilter(SkScalar sigmaX,
                       SkScalar sigmaY,
                       sk_sp<SkImageFilter> input,
                       const CropRect* cropRect);
 
     SkSize   fSigma;
     typedef SkImageFilter INHERITED;
 };
 
 #endif