Bug 1948254 - Part 4: Implement #navigate-event-firing. r=webidl,smaug

This includes:

* #fire-a-traverse-navigate-event
* #fire-a-push/replace/reload-navigate-event
* #fire-a-download-request-navigate-event

which are all implemented in terms of #inner-navigate-event-firing-algorithm.

Actually calling any of the above is only added for History.pushState and
History.replaceState using #fire-a-push/replace/reload-navigate-event.

Differential Revision: https://phabricator.services.mozilla.com/D238786

docshell/base/nsDocShell.cpp

@@ -11353,6 +11353,20 @@ nsDocShell::AddState(JS::Handle<JS::Value> aData, const nsAString& aTitle,
 
   }  // end of same-origin check
 
+  // https://html.spec.whatwg.org/#shared-history-push/replace-state-steps
+  // Step 8
+  if (nsCOMPtr<nsPIDOMWindowInner> window = document->GetInnerWindow()) {
+    if (RefPtr<Navigation> navigation = window->Navigation();
+        navigation &&
+        navigation->FirePushReplaceReloadNavigateEvent(
+            aReplace ? NavigationType::Replace : NavigationType::Push, newURI,
+            /* aIsSameDocument */ true, /* aUserInvolvement */ Nothing(),
+            /* aSourceElement */ nullptr, /* aFormDataEntryList */ Nothing(),
+            /* aNavigationAPIState */ nullptr, scContainer)) {
+      return NS_OK;
+    }
+  }
+
   // Step 8: call "URL and history update steps"
   rv = UpdateURLAndHistory(document, newURI, scContainer,
                            aReplace ? NavigationHistoryBehavior::Replace