Revert of Remove unused (by clients) SkUnitMapper (https://codereview.chromium.org/283273002/)

include/core/SkFlattenable.h

 
 /*
  * Copyright 2006 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 SkFlattenable_DEFINED
@@ skipping 43 matching lines @@
 public:
     enum Type {
         kSkColorFilter_Type,
         kSkDrawLooper_Type,
         kSkImageFilter_Type,
         kSkMaskFilter_Type,
         kSkPathEffect_Type,
         kSkPixelRef_Type,
         kSkRasterizer_Type,
         kSkShader_Type,
-        kSkUnused_Type,     // used to be SkUnitMapper
+        kSkUnitMapper_Type,
         kSkXfermode_Type,
     };
 
     SK_DECLARE_INST_COUNT(SkFlattenable)
 
     typedef SkFlattenable* (*Factory)(SkReadBuffer&);
 
     SkFlattenable() {}
 
     /** Implement this to return a factory function pointer that can be called
@@ skipping 30 matching lines @@
 
 private:
     static void InitializeFlattenablesIfNeeded();
 
     friend class SkGraphics;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif