From 4a90d1178ff2abaa811a5b1b4ea660b74ef53cc7 Mon Sep 17 00:00:00 2001
From: Alexey Lang <alexeylang@fb.com>
Date: Tue, 14 Mar 2017 13:44:54 -0700
Subject: [PATCH] Use performanceNow to calculate __BUNDLE_START_TIME__

Reviewed By: javache

Differential Revision: D4706142

fbshipit-source-id: aa983d9e5d5324f97ae34ec0190b1fc988d012c8
---
 packages/metro-bundler/src/Resolver/polyfills/prelude.js     | 4 +++-
 packages/metro-bundler/src/Resolver/polyfills/prelude_dev.js | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/packages/metro-bundler/src/Resolver/polyfills/prelude.js b/packages/metro-bundler/src/Resolver/polyfills/prelude.js
index 0451a75b..38170fa1 100644
--- a/packages/metro-bundler/src/Resolver/polyfills/prelude.js
+++ b/packages/metro-bundler/src/Resolver/polyfills/prelude.js
@@ -13,4 +13,6 @@
 
 global.__DEV__ = false;
 
-global.__BUNDLE_START_TIME__ = Date.now();
+global.__BUNDLE_START_TIME__ = global.nativePerformanceNow
+ ? global.nativePerformanceNow()
+ : Date.now();
diff --git a/packages/metro-bundler/src/Resolver/polyfills/prelude_dev.js b/packages/metro-bundler/src/Resolver/polyfills/prelude_dev.js
index 0f086fb9..caf05c28 100644
--- a/packages/metro-bundler/src/Resolver/polyfills/prelude_dev.js
+++ b/packages/metro-bundler/src/Resolver/polyfills/prelude_dev.js
@@ -13,4 +13,6 @@
 
 global.__DEV__ = true;
 
-global.__BUNDLE_START_TIME__ = Date.now();
+global.__BUNDLE_START_TIME__ = global.nativePerformanceNow
+ ? global.nativePerformanceNow()
+ : Date.now();