PerformanceLogger: log extras to console in DEV mode

Differential Revision: D7862011

fbshipit-source-id: 591caf37d6c91ccb07f13005c0f6c57dcaaa22c5

Libraries/Utilities/PerformanceLogger.js

@@ -185,6 +185,10 @@ const PerformanceLogger = {
   getExtras() {
     return extras;
   },
+
+  logExtras() {
+    infoLog(extras);
+  },
 };
 
 module.exports = PerformanceLogger;