Refactoring of CPU NormalMap handling out into its own class

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
 #define SkFlattenable_DEFINED
 
@@ skipping 63 matching lines @@
         kSkDrawable_Type,
         kSkDrawLooper_Type,
         kSkImageFilter_Type,
         kSkMaskFilter_Type,
         kSkPathEffect_Type,
         kSkPixelRef_Type,
         kSkRasterizer_Type,
         kSkShader_Type,
         kSkUnused_Type,     // used to be SkUnitMapper
         kSkXfermode_Type,
-        kNormalSource_Type,
+        kSkNormalSource_Type,
     };
 
     typedef sk_sp<SkFlattenable> (*Factory)(SkReadBuffer&);
 
     SkFlattenable() {}
 
     /** Implement this to return a factory function pointer that can be called
      to recreate your class given a buffer (previously written to by your
      override of flatten().
      */
@@ skipping 30 matching lines @@
 
 private:
     static void InitializeFlattenablesIfNeeded();
 
     friend class SkGraphics;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif