Type alias for dimensions

Summary:
Aliases `std::array<YGValue, 2>` as `YGStyle::Dimensions` for increased readability.

This prepares a follow up, where the alias is used in `Yoga.cpp`.

Reviewed By: astreet

Differential Revision: D8874566

fbshipit-source-id: a7a7a1b02bff547d7d6b800c522c4785a62ad611

ReactCommon/yoga/yoga/YGStyle.h

@@ -11,6 +11,8 @@
 #include "Yoga.h"
 
 struct YGStyle {
+  using Dimensions = std::array<YGValue, 2>;
+
   YGDirection direction;
   YGFlexDirection flexDirection;
   YGJustify justifyContent;
@@ -29,9 +31,9 @@ struct YGStyle {
   std::array<YGValue, YGEdgeCount> position;
   std::array<YGValue, YGEdgeCount> padding;
   std::array<YGValue, YGEdgeCount> border;
-  std::array<YGValue, 2> dimensions;
-  std::array<YGValue, 2> minDimensions;
-  std::array<YGValue, 2> maxDimensions;
+  Dimensions dimensions;
+  Dimensions minDimensions;
+  Dimensions maxDimensions;
   // Yoga specific properties, not compatible with flexbox specification
   YGFloatOptional aspectRatio;