From 3e81a6d5d181c701ab9081182461c12b7c37448e Mon Sep 17 00:00:00 2001
From: Paul Irish <paul.irish@gmail.com>
Date: Tue, 26 Jul 2016 15:11:14 -0400
Subject: [PATCH] compat note about firstContentfulPaint trace event.

[ci skip]
---
 lighthouse-core/audits/first-meaningful-paint.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lighthouse-core/audits/first-meaningful-paint.js b/lighthouse-core/audits/first-meaningful-paint.js
index 2b1cd28b62f2..20737af9fbb6 100644
--- a/lighthouse-core/audits/first-meaningful-paint.js
+++ b/lighthouse-core/audits/first-meaningful-paint.js
@@ -174,6 +174,7 @@ class FirstMeaningfulPaint extends Audit {
       }
       // firstContentfulPaint == the first time that text or image content was
       // painted. See src/third_party/WebKit/Source/core/paint/PaintTiming.h
+      // COMPAT: firstContentfulPaint trace event first introduced in Chrome 49 (r370921)
       if (event.name === 'firstContentfulPaint' && event.args.frame === mainFrameID) {
         firstContentfulPaint = event;
       }