Everyone gets a namespace {}.

src/opts/SkPMFloat_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.
  */
 
+namespace { // See SkPMFloat.h
+
 // For SkPMFloat(SkPMFColor), we widen our 8 bit components (fix8) to 8-bit components in 16 bits
 // (fix8_16), then widen those to 8-bit-in-32-bits (fix8_32), and finally convert those to floats.
 
 // round() and roundClamp() do the opposite, working from floats to 8-bit-in-32-bit,
 // to 8-bit-in-16-bit, back down to 8-bit components.
 // roundClamp() uses vqmovn to clamp while narrowing instead of just narrowing with vmovn.
 
 inline SkPMFloat::SkPMFloat(SkPMColor c) {
     SkPMColorAssert(c);
     uint8x8_t   fix8    = (uint8x8_t)vdup_n_u32(c);
@@ skipping 45 matching lines @@
 }
 
 inline void SkPMFloat::RoundClampTo4PMColors(
         const SkPMFloat& a, const SkPMFloat& b, const SkPMFloat&c, const SkPMFloat& d,
         SkPMColor colors[4]) {
     colors[0] = a.roundClamp();
     colors[1] = b.roundClamp();
     colors[2] = c.roundClamp();
     colors[3] = d.roundClamp();
 }
+
+}  // namespace