fix(core): use window.performance for compatibility in JSDOM (#9700)

fix #9698

src/core/observer/scheduler.js

@@ -47,9 +47,10 @@ let getNow: () => number = Date.now
 // timestamp can either be hi-res (relative to page load) or low-res
 // (relative to UNIX epoch), so in order to compare time we have to use the
 // same timestamp type when saving the flush timestamp.
+if (inBrowser) {
+  const performance = window.performance
   if (
-  inBrowser &&
+    performance &&
-  window.performance &&
     typeof performance.now === 'function' &&
     document.createEvent('Event').timeStamp <= performance.now()
   ) {
@@ -58,6 +59,7 @@ if (
     // and we need to use the lo-res version for event listeners as well.
     getNow = () => performance.now()
   }
+}
 
 /**
  * Flush both queues and run the watchers.