Auto merge of #20671 - cbrewster:history_url, r=asajeffrey

Make session history aware of URLs

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components/script_traits/script_msg.rs

@@ -105,9 +105,9 @@ pub enum ScriptMsg {
     /// HTMLIFrameElement Forward or Back traversal.
     TraverseHistory(TraversalDirection),
     /// Inform the constellation of a pushed history state.
-    PushHistoryState(HistoryStateId),
+    PushHistoryState(HistoryStateId, ServoUrl),
     /// Inform the constellation of a replaced history state.
-    ReplaceHistoryState(HistoryStateId),
+    ReplaceHistoryState(HistoryStateId, ServoUrl),
     /// Gets the length of the joint session history from the constellation.
     JointSessionHistoryLength(IpcSender<u32>),
     /// Favicon detected