From cb3a07306e5ef86146270782faa90830cc72ae8c Mon Sep 17 00:00:00 2001
From: Tadeu Zagallo <tadeuzagallo@fb.com>
Date: Mon, 2 Nov 2015 08:13:42 -0800
Subject: [PATCH] Expose `RCTPerformanceNow`, microsecond precision time for
 JavaScript

Summary: public

Expose a more precise timer, millisecond precision is enough to measure small operations.

Reviewed By: javache

Differential Revision: D2604218

fb-gh-sync-id: ba50c891b5690575548fe04ba1ae7d015bc31d90
---
 React/Executors/RCTContextExecutor.m | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/React/Executors/RCTContextExecutor.m b/React/Executors/RCTContextExecutor.m
index c4315e8d5..429bb0f62 100644
--- a/React/Executors/RCTContextExecutor.m
+++ b/React/Executors/RCTContextExecutor.m
@@ -353,6 +353,10 @@ static void RCTInstallJSCProfiler(RCTBridge *bridge, JSContextRef context)
       [bridge handleBuffer:calls batchEnded:NO];
     };
 
+    strongSelf->_context.context[@"RCTPerformanceNow"] = ^(){
+      return CACurrentMediaTime() * 1000 * 1000;
+    };
+
 #if RCT_DEV
     if (RCTProfileIsProfiling()) {
       strongSelf->_context.context[@"__RCTProfileIsProfiling"] = @YES;