Use float rather than SkFixed for gradient TileProcs.

src/effects/gradients/SkClampRange.h

Index: src/effects/gradients/SkClampRange.h
diff --git a/src/effects/gradients/SkClampRange.h b/src/effects/gradients/SkClampRange.h
index d3d2d08c86d8a38861a24e3ba009dfa32cf1f8dd..5b121a5b442bace50fa54e041484264c14c11a84 100644
--- a/src/effects/gradients/SkClampRange.h
+++ b/src/effects/gradients/SkClampRange.h
@@ -13,8 +13,10 @@
 
 #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
 
 /**
@@ -33,7 +35,7 @@ struct SkClampRange {
                     // 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