Node -> Measure func map instead of vec (#1581)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1581

This is better than just trusting the order of the measure func call. Now each measure function I/O is associated with a node in the JSON.

Reviewed By: NickGerleman

Differential Revision: D53776790

fbshipit-source-id: 793cf2d9cbf6f663d24848af0af30aa297614eea

benchmark/TreeDeserialization.cpp

@@ -228,18 +228,14 @@ YGMeasureMode measureModeFromString(std::string str) {
   }
 }
 
-void populateMeasureFuncVec(
-    json& j,
-    std::shared_ptr<MeasureFuncVecWithIndex> fns) {
-  for (auto measureFuncJson : j) {
-    fns->vec.push_back(SerializedMeasureFunc{
-        floatFromJson(measureFuncJson["width"]),
-        measureModeFromString(measureFuncJson["width-mode"]),
-        floatFromJson(measureFuncJson["height"]),
-        measureModeFromString(measureFuncJson["height-mode"]),
-        floatFromJson(measureFuncJson["output-width"]),
-        floatFromJson(measureFuncJson["output-height"]),
-        measureFuncJson["duration-ns"]});
-  }
+SerializedMeasureFunc serializedMeasureFuncFromJson(json& j) {
+  return SerializedMeasureFunc{
+      floatFromJson(j["width"]),
+      measureModeFromString(j["width-mode"]),
+      floatFromJson(j["height"]),
+      measureModeFromString(j["height-mode"]),
+      floatFromJson(j["output-width"]),
+      floatFromJson(j["output-height"]),
+      j["duration-ns"]};
 }
 } // namespace facebook::yoga