Perform color correction on png decodes

src/opts/SkNx_neon.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 SkNx_neon_DEFINED
 #define SkNx_neon_DEFINED
 
@@ skipping 392 matching lines @@
         return vreinterpretq_s32_u32(vcgtq_s32(fVec, o.fVec));
     }
 
     static SkNx Min(const SkNx& a, const SkNx& b) { return vminq_s32(a.fVec, b.fVec); }
     // TODO as needed
 
     SkNx thenElse(const SkNx& t, const SkNx& e) const {
         return vbslq_s32(vreinterpretq_u32_s32(fVec), t.fVec, e.fVec);
     }
 
+    SkNx logicalShiftRight(int bits) const {
+        SHIFT32(vshrq_n_u32, vreinterpretq_u32_s32(fVec), bits);
+    }
+
     int32x4_t fVec;
 };
 
 #undef SHIFT32
 #undef SHIFT16
 #undef SHIFT8
 
 template<> inline Sk4i SkNx_cast<int, float>(const Sk4f& src) {
     return vcvtq_s32_f32(src.fVec);
 
@@ skipping 65 matching lines @@
     uint16x4x4_t rgba = {{
         r.fVec,
         g.fVec,
         b.fVec,
         a.fVec,
     }};
     vst4_u16((uint16_t*) dst, rgba);
 }
 
 #endif//SkNx_neon_DEFINED