From 02daffbe9d8dc15191becf3d2bca3afa99d4242e Mon Sep 17 00:00:00 2001
From: Aaron Chiu <aaronechiu@fb.com>
Date: Tue, 21 Feb 2017 22:12:35 -0800
Subject: [PATCH] print out Performance markers to console

Differential Revision: D4585709

fbshipit-source-id: fe1f1f6b146854aa426e6186baf73ac2cf1784c8
---
 Libraries/Utilities/PerformanceLogger.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Libraries/Utilities/PerformanceLogger.js b/Libraries/Utilities/PerformanceLogger.js
index 8772a2ae0..fd77037d8 100644
--- a/Libraries/Utilities/PerformanceLogger.js
+++ b/Libraries/Utilities/PerformanceLogger.js
@@ -18,6 +18,8 @@ var timespans = {};
 var extras = {};
 var cookies = {};
 
+const PRINT_TO_CONSOLE = false;
+
 /**
  * This is meant to collect and log performance data in production, which means
  * it needs to have minimal overhead.
@@ -56,6 +58,9 @@ var PerformanceLogger = {
       startTime: performanceNow(),
     };
     cookies[key] = Systrace.beginAsyncEvent(key);
+    if (__DEV__ && PRINT_TO_CONSOLE) {
+      console.log('PerformanceLogger.js', 'start: ' + key);
+    }
   },
 
   stopTimespan(key) {
@@ -78,6 +83,9 @@ var PerformanceLogger = {
       return;
     }
 
+    if (__DEV__ && PRINT_TO_CONSOLE) {
+      console.log('PerformanceLogger.js', 'end: ' + key);
+    }
     Systrace.endAsyncEvent(key, cookies[key]);
     delete cookies[key];
     timespans[key].endTime = performanceNow();