Refactor to put SkXfermode_opts inside SK_OPTS_NS.

src/opts/SkPMFloat_none.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
-
-inline SkPMFloat::SkPMFloat(SkPMColor c) {
+SK_ALWAYS_INLINE SkPMFloat::SkPMFloat(SkPMColor c) {
     float inv255 = 1.0f/255;
     *this = SkPMFloat::FromARGB(SkGetPackedA32(c) * inv255,
                                 SkGetPackedR32(c) * inv255,
                                 SkGetPackedG32(c) * inv255,
                                 SkGetPackedB32(c) * inv255);
     SkASSERT(this->isValid());
 }
 
-inline SkPMColor SkPMFloat::round() const {
+SK_ALWAYS_INLINE SkPMColor SkPMFloat::round() const {
     float a = this->a(),
           r = this->r(),
           g = this->g(),
           b = this->b();
     a = a < 0 ? 0 : (a > 1 ? 1 : a);
     r = r < 0 ? 0 : (r > 1 ? 1 : r);
     g = g < 0 ? 0 : (g > 1 ? 1 : g);
     b = b < 0 ? 0 : (b > 1 ? 1 : b);
     SkPMColor c = SkPackARGB32(255*a+0.5f, 255*r+0.5f, 255*g+0.5f, 255*b+0.5f);
     SkPMColorAssert(c);
     return c;
 }
 
-inline Sk4f SkPMFloat::alphas() const {
+SK_ALWAYS_INLINE Sk4f SkPMFloat::alphas() const {
     return Sk4f(this->a());
 }
-
-}  // namespace