Revert of stop calling SkScalarDiv

src/animator/SkDrawColor.cpp

Index: src/animator/SkDrawColor.cpp
diff --git a/src/animator/SkDrawColor.cpp b/src/animator/SkDrawColor.cpp
index d86a2e93e7261875418395b9811fe06840a6ed64..eb57d9dad49ed041e0c748d2db95718786357955 100644
--- a/src/animator/SkDrawColor.cpp
+++ b/src/animator/SkDrawColor.cpp
@@ -30,14 +30,14 @@
     if (choice == kGetValue)
         return value/255;
     SkScalar delta = value - min;
-    SkScalar saturation = value == 0 ? 0 : delta / value;
+    SkScalar saturation = value == 0 ? 0 : SkScalarDiv(delta, value);
     if (choice == kGetSaturation)
         return saturation;
     SkScalar hue;
     if (saturation == 0)
         hue = 0;
     else {
-        SkScalar part60 = 60 / delta;
+        SkScalar part60 = SkScalarDiv(60 * SK_Scalar1, delta);
         if (red == value) {
             hue = SkScalarMul(green - blue, part60);
             if (hue < 0)