Auto merge of #22319 - kkpoon:add-redirect-start, r=jdm

Add PerformanceResourceTiming: redirectStart

1. Added `RedirectStart` to `ResourceAttribute` in `net_traits` crate
2. Match the enum in `set_attribute` to record the start time in `ResourceFetchTiming.redirect_start`.
3. In `http_loader.rs::http_fetch`, added the call the context timing on the `RedirectStart`

fix 21256

- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #21256 (github issue number if applicable).

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1 files changed, 1 insertions, 1 deletions

diff --git a/components/script/dom/webidls/PerformanceResourceTiming.webidl b/components/script/dom/webidls/PerformanceResourceTiming.webidl
index b63f341b1c9..7e9e394ab6b 100644
--- a/components/script/dom/webidls/PerformanceResourceTiming.webidl
+++ b/components/script/dom/webidls/PerformanceResourceTiming.webidl
@@ -12,7 +12,7 @@ interface PerformanceResourceTiming : PerformanceEntry {
     readonly attribute DOMString           initiatorType;
     readonly attribute DOMString           nextHopProtocol;
     // readonly attribute DOMHighResTimeStamp workerStart;
-    // readonly attribute DOMHighResTimeStamp redirectStart;
+    readonly attribute DOMHighResTimeStamp redirectStart;
     // readonly attribute DOMHighResTimeStamp redirectEnd;
     readonly attribute DOMHighResTimeStamp fetchStart;
     // readonly attribute DOMHighResTimeStamp domainLookupStart;