Fix rounding error using double instead of float

Summary: Changelog: [Internal] [Yoga] Use double instead of float during rounding process to prevent loss of precision.

Reviewed By: mdvacca

Differential Revision: D21227565

fbshipit-source-id: 380b57535a356624cda8dc2017871a4ef3c882d1

yoga/Yoga.h

@@ -352,8 +352,8 @@ WIN_EXPORT void YGConfigSetContext(YGConfigRef config, void* context);
 WIN_EXPORT void* YGConfigGetContext(YGConfigRef config);
 
 WIN_EXPORT float YGRoundValueToPixelGrid(
-    float value,
-    float pointScaleFactor,
+    double value,
+    double pointScaleFactor,
     bool forceCeil,
     bool forceFloor);