Port SkBlurImage opts to SkOpts.

src/opts/SkXfermode_opts.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 Sk4pxXfermode_DEFINED
 #define Sk4pxXfermode_DEFINED
 
 #include "Sk4px.h"
 #include "SkPMFloat.h"
 #include "SkXfermode_proccoeff.h"
 
-// This file is possibly included into multiple .cpp files.
-// Each gets its own independent instantiation by wrapping in an anonymous namespace.
-namespace {
+namespace /* TODO: SK_OPTS_NS */ {
 
 // Most xfermodes can be done most efficiently 4 pixels at a time in 8 or 16-bit fixed point.
 #define XFERMODE(Name) static Sk4px SK_VECTORCALL Name(Sk4px s, Sk4px d)
 
 XFERMODE(Clear) { return Sk4px::DupPMColor(0); }
 XFERMODE(Src)   { return s; }
 XFERMODE(Dst)   { return d; }
 XFERMODE(SrcIn)   { return     s.approxMulDiv255(d.alphas()      ); }
 XFERMODE(SrcOut)  { return     s.approxMulDiv255(d.alphas().inv()); }
 XFERMODE(SrcOver) { return s + d.approxMulDiv255(s.alphas().inv()); }
@@ skipping 281 matching lines @@
         CASE(ColorDodge);
         CASE(ColorBurn);
         CASE(SoftLight);
     #undef CASE
 
         default: break;
     }
     return nullptr;
 }
 
-} // namespace
+} // namespace SK_NS_OPTS
 
 #endif//Sk4pxXfermode_DEFINED