Revert[2] of float color components

src/core/SkMathPriv.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkMathPriv_DEFINED
 #define SkMathPriv_DEFINED
 
@@ skipping 60 matching lines @@
     return (prod + (prod >> 8)) >> 8;
 }
 
 /** Just the rounding step in SkDiv255Round: round(value / 255)
  */
 static inline unsigned SkDiv255Round(unsigned prod) {
     prod += 128;
     return (prod + (prod >> 8)) >> 8;
 }
 
+static inline float SkPinToUnitFloat(float x) {
+    return SkTMin(SkTMax(x, 0.0f), 1.0f);
+}
+
 #endif