From 50965fb22347a255996efa3fa84f96dbe6a49be4 Mon Sep 17 00:00:00 2001
From: Moonchild <moonchild@palemoon.org>
Date: Wed, 4 May 2022 17:24:10 +0000
Subject: [PATCH] No issue - Align our resource timing with the updated Fetch
 spec.

This makes FetchStart use StartTime() when the TAO check fails for
PerformanceResourceTiming

Given the recent Fetch spec updates, Step 8.1 in
https://fetch.spec.whatwg.org/#finalize-and-report-timing specifies that start
time(StartTime) and post-redirect start time(FetchStart) should be start time
when the TAO check fails.
---
 dom/performance/PerformanceResourceTiming.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/dom/performance/PerformanceResourceTiming.h b/dom/performance/PerformanceResourceTiming.h
index 61ad8f0c65..b4775d4322 100644
--- a/dom/performance/PerformanceResourceTiming.h
+++ b/dom/performance/PerformanceResourceTiming.h
@@ -69,9 +69,12 @@ public:
   }
 
   DOMHighResTimeStamp FetchStart() const {
-    return mTiming
+    if (mTiming) {
+      return mTiming->TimingAllowed()
         ? mTiming->FetchStartHighRes()
-        : 0;
+        : StartTime();
+    }
+    return 0;
   }
 
   DOMHighResTimeStamp RedirectStart() const {