Everyone gets a namespace {}.

src/opts/SkPMFloat_SSSE3.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(SkPMColor), we widen our 8 bit components (fix8) to 8-bit components in 32 bits
 // (fix8_32), then convert those to floats.
 
 // round() does the opposite, working from floats to 8-bit-in-32-bits, then back to packed 8 bit.
 
 // roundClamp() is the same as _SSE2: floats to 8-in-32, to 8-in-16, to packed 8 bit, with
 // _mm_packus_epi16() both clamping and narrowing.
 
 inline SkPMFloat::SkPMFloat(SkPMColor c) {
     SkPMColorAssert(c);
@@ skipping 56 matching lines @@
             c2 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), c.fVec)),
             c3 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), d.fVec));
     __m128i c3210 = _mm_packus_epi16(_mm_packus_epi16(c0, c1),
                                      _mm_packus_epi16(c2, c3));
     _mm_storeu_si128((__m128i*)colors, c3210);
     SkPMColorAssert(colors[0]);
     SkPMColorAssert(colors[1]);
     SkPMColorAssert(colors[2]);
     SkPMColorAssert(colors[3]);
 }
+
+}  // namespace