SkPMFloat: fewer internal this->isValid() assertions.

src/opts/SkPMFloat_none.h

Index: src/opts/SkPMFloat_none.h
diff --git a/src/opts/SkPMFloat_none.h b/src/opts/SkPMFloat_none.h
index 19557f11de06a8df37c4dc5dba3bd68ab42f5a0f..7f03f2f53a47a869fc34976d4edea88fe7a868c6 100644
--- a/src/opts/SkPMFloat_none.h
+++ b/src/opts/SkPMFloat_none.h
@@ -18,8 +18,9 @@ inline SkPMColor SkPMFloat::trunc() const {
 }
 
 inline SkPMColor SkPMFloat::get() const {
-    SkASSERT(this->isValid());
-    return SkPackARGB32(this->a()+0.5f, this->r()+0.5f, this->g()+0.5f, this->b()+0.5f);
+    SkPMColor c = SkPackARGB32(this->a()+0.5f, this->r()+0.5f, this->g()+0.5f, this->b()+0.5f);
+    SkPMColorAssert(c);
+    return c;
 }
 
 inline SkPMColor SkPMFloat::clamped() const {
@@ -31,7 +32,9 @@ inline SkPMColor SkPMFloat::clamped() const {
     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+0.5f, r+0.5f, g+0.5f, b+0.5f);
+    SkPMColor c = SkPackARGB32(a+0.5f, r+0.5f, g+0.5f, b+0.5f);
+    SkPMColorAssert(c);
+    return c;
 }
 
 inline void SkPMFloat::From4PMColors(const SkPMColor colors[4],