extend modecolorfilter to 4f

src/core/SkXfermode_proccoeff.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkXfermode_proccoeff_DEFINED
 #define SkXfermode_proccoeff_DEFINED
 
 #include "SkXfermode.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 
 struct ProcCoeff {
     SkXfermodeProc      fProc;
+    SkXfermodeProc4f    fProc4f;
     SkXfermode::Coeff   fSC;
     SkXfermode::Coeff   fDC;
 };
 
 #define CANNOT_USE_COEFF    SkXfermode::Coeff(-1)
 
 class SK_API SkProcCoeffXfermode : public SkXfermode {
 public:
     SkProcCoeffXfermode(const ProcCoeff& rec, Mode mode) {
         fMode = mode;
@@ skipping 37 matching lines @@
     SkXfermodeProc  fProc;
     Mode            fMode;
     Coeff           fSrcCoeff, fDstCoeff;
 
     friend class SkXfermode;
 
     typedef SkXfermode INHERITED;
 };
 
 #endif // #ifndef SkXfermode_proccoeff_DEFINED