Use float rather than SkFixed for gradient TileProcs.

include/core/SkScalar.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkScalar_DEFINED
 #define SkScalar_DEFINED
 
@@ skipping 16 matching lines @@
 #define SK_ScalarPI                 3.14159265f
 #define SK_ScalarTanPIOver8         0.414213562f
 #define SK_ScalarRoot2Over2         0.707106781f
 #define SK_ScalarMax                3.402823466e+38f
 #define SK_ScalarInfinity           SK_FloatInfinity
 #define SK_ScalarNegativeInfinity   SK_FloatNegativeInfinity
 #define SK_ScalarNaN                SK_FloatNaN
 
 #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)
 #define SkScalarRoundToScalar(x)    sk_float_floor((x) + 0.5f)
 
 #define SkScalarFloorToInt(x)       sk_float_floor2int(x)
 #define SkScalarCeilToInt(x)        sk_float_ceil2int(x)
 #define SkScalarRoundToInt(x)       sk_float_round2int(x)
 
 #define SkScalarAbs(x)              sk_float_abs(x)
@@ skipping 23 matching lines @@
 #define SK_ScalarPI                 3.141592653589793
 #define SK_ScalarTanPIOver8         0.4142135623731
 #define SK_ScalarRoot2Over2         0.70710678118655
 #define SK_ScalarMax                1.7976931348623157+308
 #define SK_ScalarInfinity           SK_DoubleInfinity
 #define SK_ScalarNegativeInfinity   SK_DoubleNegativeInfinity
 #define SK_ScalarNaN                SK_DoubleNaN
 
 #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)
 #define SkScalarRoundToScalar(x)    floor((x) + 0.5)
 
 #define SkScalarFloorToInt(x)       (int)floor(x)
 #define SkScalarCeilToInt(x)        (int)ceil(x)
 #define SkScalarRoundToInt(x)       (int)floor((x) + 0.5)
 
 #define SkScalarAbs(x)              abs(x)
@@ skipping 170 matching lines @@
     SkASSERT(n >= 0);
     for (int i = 0; i < n; ++i) {
         if (a[i] != b[i]) {
             return false;
         }
     }
     return true;
 }
 
 #endif