Use float rather than SkFixed for gradient TileProcs.

include/core/SkScalar.h

Index: include/core/SkScalar.h
diff --git a/include/core/SkScalar.h b/include/core/SkScalar.h
index 84b53c85751630a60c35e28b72b0a684c03d7f62..a18775457ebeabf7295cd3e3bfd76382aae08d4f 100644
--- a/include/core/SkScalar.h
+++ b/include/core/SkScalar.h
@@ -34,6 +34,7 @@ typedef float SkScalar;
 
 #define SkFixedToScalar(x)          SkFixedToFloat(x)
 #define SkScalarToFixed(x)          SkFloatToFixed(x)
+#define SkScalarPinToFixed(x)       SkFloatPinToFixed(x)
 
 #define SkScalarFloorToScalar(x)    sk_float_floor(x)
 #define SkScalarCeilToScalar(x)     sk_float_ceil(x)
@@ -77,6 +78,7 @@ typedef double SkScalar;
 
 #define SkFixedToScalar(x)          SkFixedToDouble(x)
 #define SkScalarToFixed(x)          SkDoubleToFixed(x)
+#define SkScalarPinToFixed(x)       SkDoublePinToFixed(x)
 
 #define SkScalarFloorToScalar(x)    floor(x)
 #define SkScalarCeilToScalar(x)     ceil(x)