Use float rather than SkFixed for gradient TileProcs.

src/effects/gradients/SkClampRange.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkClampRange_DEFINED
 #define SkClampRange_DEFINED
 
 #include "SkFixed.h"
 #include "SkScalar.h"
 
 #define SkGradFixed             SkFixed3232
 #define SkScalarToGradFixed(x)  SkScalarToFixed3232(x)
+#define SkFloatToGradFixed(x)   SkFloatToFixed3232(x)
 #define SkFixedToGradFixed(x)   SkFixedToFixed3232(x)
 #define SkGradFixedToFixed(x)   (SkFixed)((x) >> 16)
+#define SkGradFixedToFloat(x)   SkFixed3232ToFloat(x)
 #define kFracMax_SkGradFixed    0xFFFFFFFFLL
 
 /**
  *  Iteration fixed fx by dx, clamping as you go to [0..kFracMax_SkGradFixed], this class
  *  computes the (up to) 3 spans there are:
  *
  *  range0: use constant value V0
  *  range1: iterate as usual fx += dx
  *  range2: use constant value V1
  */
 struct SkClampRange {
     int fCount0;    // count for fV0
     int fCount1;    // count for interpolating (fV0...fV1)
     int fCount2;    // count for fV1
     SkGradFixed fFx1;   // initial fx value for the fCount1 range.
                     // only valid if fCount1 > 0
     int fV0, fV1;
 
-    void init(SkGradFixed fx, SkGradFixed dx, int count, int v0, int v1);
+    void init(float fx, float dx, int count, int v0, int v1);
 
     void validate(int count) const {
 #ifdef SK_DEBUG
         SkASSERT(fCount0 >= 0);
         SkASSERT(fCount1 >= 0);
         SkASSERT(fCount2 >= 0);
         SkASSERT(fCount0 + fCount1 + fCount2 == count);
 #endif
     }
 
 private:
     void initFor1(SkGradFixed fx);
 };
 
 #endif