Port SkBlurImage opts to SkOpts.

src/opts/SkOpts_neon.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkFloatingPoint.h"
 #include "SkOpts.h"
+#define SK_OPTS_NS neon
+#include "SkBlurImageFilter_opts.h"
 #include "SkXfermode_opts.h"
 
 namespace neon {  // This helps identify methods from this file when debugging / profiling.
 
 static float rsqrt(float x) {
     return sk_float_rsqrt(x);  // This sk_float_rsqrt copy will take the NEON compile-time path.
 }
 
 static void memset16(uint16_t* dst, uint16_t value, int n) {
     uint16x8_t   v8  = vdupq_n_u16(value);
@@ skipping 44 matching lines @@
 }
 
 }  // namespace neon
 
 namespace SkOpts {
     void Init_neon() {
         rsqrt           = neon::rsqrt;
         memset16        = neon::memset16;
         memset32        = neon::memset32;
         create_xfermode = SkCreate4pxXfermode;
+
+        static const auto x = neon::kX, y = neon::kY;
+        box_blur_xx = neon::box_blur<x,x>;
+        box_blur_xy = neon::box_blur<x,y>;
+        box_blur_yx = neon::box_blur<y,x>;
     }
 }