Cache dst LUTs in SkColorSpaceXform

include/core/SkColorSpaceXform.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkColorSpaceXform_DEFINED
 #define SkColorSpaceXform_DEFINED
 
@@ skipping 32 matching lines @@
      *  @param dstColorFormat Describes color format of |dst|
      *  @param srcColorFormat Describes color format of |src|
      *                        Must be kRGBA_8888 or kBGRA_8888
      *  @param alphaType      Describes alpha properties of the |dst| (and |src|)
      *                        kUnpremul preserves input alpha values
      *                        kPremul   performs a premultiplication and also preserves alpha values
      *                        kOpaque   optimization hint, |dst| alphas set to 1
      *
      */
     bool apply(ColorFormat dstFormat, void* dst, ColorFormat srcFormat, const void* src, int count,
-               SkAlphaType alphaType) const {
-        return this->onApply(dstFormat, dst, srcFormat, src, count, alphaType);
-    }
-
+               SkAlphaType alphaType) const;
 
     virtual ~SkColorSpaceXform() {}
 
 protected:
-    virtual bool onApply(ColorFormat dstFormat, void* dst, ColorFormat srcFormat, const void* src,
-                         int count, SkAlphaType alphaType) const = 0;
-
     SkColorSpaceXform() {}
 };
 
 #endif