Use float rather than SkFixed for gradient TileProcs.

src/effects/gradients/SkRadialGradient.cpp

Index: src/effects/gradients/SkRadialGradient.cpp
diff --git a/src/effects/gradients/SkRadialGradient.cpp b/src/effects/gradients/SkRadialGradient.cpp
index d175f238cd60a9ac67b97eda59fc3587f1718944..ad92b5659beae5321389f992ac3cea4cae3a65f8 100644
--- a/src/effects/gradients/SkRadialGradient.cpp
+++ b/src/effects/gradients/SkRadialGradient.cpp
@@ -12,11 +12,11 @@
 namespace {
 
 // GCC doesn't like using static functions as template arguments.  So force these to be non-static.
-inline SkFixed mirror_tileproc_nonstatic(SkFixed x) {
+inline unsigned mirror_tileproc_nonstatic(float x) {
     return mirror_tileproc(x);
 }
 
-inline SkFixed repeat_tileproc_nonstatic(SkFixed x) {
+inline unsigned repeat_tileproc_nonstatic(float x) {
     return repeat_tileproc(x);
 }
 
@@ -159,12 +159,12 @@ void shadeSpan_radial_clamp2(SkScalar sfx, SkScalar sdx, SkScalar sfy, SkScalar
 // Unrolling this loop doesn't seem to help (when float); we're stalling to
 // get the results of the sqrt (?), and don't have enough extra registers to
 // have many in flight.
-template <SkFixed (*TileProc)(SkFixed)>
+template <unsigned (*TileProc)(float)>
 void shadeSpan_radial(SkScalar fx, SkScalar dx, SkScalar fy, SkScalar dy,
                       SkPMColor* SK_RESTRICT dstC, const SkPMColor* SK_RESTRICT cache,
                       int count, int toggle) {
     do {
-        const SkFixed dist = SkFloatToFixed(sk_float_sqrt(fx*fx + fy*fy));
+        const float dist = sk_float_sqrt(fx*fx + fy*fy);
         const unsigned fi = TileProc(dist);
         SkASSERT(fi <= 0xFFFF);
         *dstC++ = cache[toggle + (fi >> SkGradientShaderBase::kCache32Shift)];
@@ -228,7 +228,7 @@ void SkRadialGradient::RadialGradientContext::shadeSpan(int x, int y,
         SkScalar dstY = SkIntToScalar(y);
         do {
             dstProc(fDstToIndex, dstX, dstY, &srcPt);
-            unsigned fi = proc(SkScalarToFixed(srcPt.length()));
+            unsigned fi = proc(SkScalarToFloat(srcPt.length()));
             SkASSERT(fi <= 0xFFFF);
             *dstC++ = cache[fi >> SkGradientShaderBase::kCache32Shift];
             dstX += SK_Scalar1;