Auto merge of #23812 - tdelacour:ISSUE-21257, r=jdm

ISSUE-21257: set redirectEnd on PerformanceResourceTiming

<!-- Please describe your changes on the following line: -->
Added the appropriate attribute and setters. Included a Timer struct with a `Drop` function to set this value to zero in error cases. Set the value to `responseEnd` on success. Eliminated tests that now pass.

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #21257 (GitHub issue number if applicable)

<!-- Either: -->
- [X] There are tests for these changes OR
- [ ] These changes do not require tests because ___

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/23812)
<!-- Reviewable:end -->

components/script/dom/performanceresourcetiming.rs

@@ -59,8 +59,6 @@ pub struct PerformanceResourceTiming {
 // TODO(#21255): duration
 // TODO(#21269): next_hop
 // TODO(#21264): worker_start
-// TODO(#21256): redirect_start
-// TODO(#21257): redirect_end
 // TODO(#21258): fetch_start
 // TODO(#21259): domain_lookup_start
 // TODO(#21260): domain_lookup_end
@@ -116,7 +114,7 @@ impl PerformanceResourceTiming {
             next_hop: next_hop,
             worker_start: 0.,
             redirect_start: resource_timing.redirect_start as f64,
-            redirect_end: 0.,
+            redirect_end: resource_timing.redirect_end as f64,
             fetch_start: resource_timing.fetch_start as f64,
             domain_lookup_start: resource_timing.domain_lookup_start as f64,
             domain_lookup_end: 0.,
@@ -187,6 +185,11 @@ impl PerformanceResourceTimingMethods for PerformanceResourceTiming {
         Finite::wrap(self.redirect_start)
     }
 
+    // https://w3c.github.io/resource-timing/#dom-performanceresourcetiming-redirectend
+    fn RedirectEnd(&self) -> DOMHighResTimeStamp {
+        Finite::wrap(self.redirect_end)
+    }
+
     // https://w3c.github.io/resource-timing/#dom-performanceresourcetiming-responsestart
     fn ResponseStart(&self) -> DOMHighResTimeStamp {
         Finite::wrap(self.response_start)

components/script/dom/webidls/PerformanceResourceTiming.webidl

@@ -13,7 +13,7 @@ interface PerformanceResourceTiming : PerformanceEntry {
     readonly attribute DOMString           nextHopProtocol;
     // readonly attribute DOMHighResTimeStamp workerStart;
     readonly attribute DOMHighResTimeStamp redirectStart;
-    // readonly attribute DOMHighResTimeStamp redirectEnd;
+    readonly attribute DOMHighResTimeStamp redirectEnd;
     readonly attribute DOMHighResTimeStamp fetchStart;
     readonly attribute DOMHighResTimeStamp domainLookupStart;
     // readonly attribute DOMHighResTimeStamp domainLookupEnd;