Change SkMatrix::fixedStepInX to return SkVector rather than SkFixed.

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 7e7ac7a4069b0ed7b438b64f0ebfdac2df227807..020c25ec46cd95005c8644e29c84b5aa72733a91 100644
--- a/src/effects/gradients/SkRadialGradient.cpp
+++ b/src/effects/gradients/SkRadialGradient.cpp
@@ -206,11 +206,9 @@ void SkRadialGradient::RadialGradientContext::shadeSpan(int x, int y,
         SkScalar sdy = fDstToIndex.getSkewY();
 
         if (fDstToIndexClass == kFixedStepInX_MatrixClass) {
-            SkFixed storage[2];
-            (void)fDstToIndex.fixedStepInX(SkIntToScalar(y),
-                                           &storage[0], &storage[1]);
-            sdx = SkFixedToScalar(storage[0]);
-            sdy = SkFixedToScalar(storage[1]);
+            const auto step = fDstToIndex.fixedStepInX(SkIntToScalar(y));
+            sdx = step.fX;
+            sdy = step.fY;
         } else {
             SkASSERT(fDstToIndexClass == kLinear_MatrixClass);
         }