Fabric: Implementation of getDebugDescription for std::array

Summary:
Yoga uses `std::array` a lot (and `std::array` is not a `std::vector`), so it's useful for printing Yoga values.

Changelog: [Internal] Fabric-specific internal change.

Reviewed By: mdvacca

Differential Revision: D21028570

fbshipit-source-id: c6bf114d5362f085ea201ecdc5b7d59646b33ebd

ReactCommon/fabric/debug/DebugStringConvertible.h

@@ -302,6 +302,23 @@ std::vector<T, Ts...> getDebugChildren(
   return vector;
 }
 
+// `std::array<T, Size>`
+template <typename T, size_t Size>
+std::string getDebugName(std::array<T, Size> const &array) {
+  return "List";
+}
+
+template <typename T, size_t Size>
+std::vector<T> getDebugChildren(
+    std::array<T, Size> const &array,
+    DebugStringConvertibleOptions options) {
+  auto vector = std::vector<T>{};
+  for (auto const &value : array) {
+    vector.push_back(value);
+  }
+  return vector;
+}
+
 // `std::unordered_set<T>`
 template <typename T, typename... Ts>
 std::string getDebugName(std::unordered_set<T, Ts...> const &set) {