Make SkPMFloats store floats in [0,255] instead of [0,1].

src/opts/SkPMFloat_none.h

 #include "SkColorPriv.h"
 
 inline void SkPMFloat::set(SkPMColor c) {
-    float scale = 1.0f / 255.0f;
-    this->setA(SkGetPackedA32(c) * scale);
-    this->setR(SkGetPackedR32(c) * scale);
-    this->setG(SkGetPackedG32(c) * scale);
-    this->setB(SkGetPackedB32(c) * scale);
+    this->setA(SkGetPackedA32(c));
+    this->setR(SkGetPackedR32(c));
+    this->setG(SkGetPackedG32(c));
+    this->setB(SkGetPackedB32(c));
     SkASSERT(this->isValid());
 }
 
 inline SkPMColor SkPMFloat::get() const {
     SkASSERT(this->isValid());
-    return SkPackARGB32(this->a() * 255, this->r() * 255, this->g() * 255, this->b() * 255);
+    return SkPackARGB32(this->a(), this->r(), this->g(), this->b());
 }
 
 inline SkPMColor SkPMFloat::clamped() 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);
-    return SkPackARGB32(a * 255, r * 255, g * 255, b * 255);
+    a = a < 0 ? 0 : (a > 255 ? 255 : a);
+    r = r < 0 ? 0 : (r > 255 ? 255 : r);
+    g = g < 0 ? 0 : (g > 255 ? 255 : g);
+    b = b < 0 ? 0 : (b > 255 ? 255 : b);
+    return SkPackARGB32(a, r, g, b);
 }