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

fix #9698

src/core/observer/scheduler.js

@@ -47,16 +47,18 @@ 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 (
+if (inBrowser) {
-  inBrowser &&
+  const performance = window.performance
-  window.performance &&
+  if (
+    performance &&
     typeof performance.now === 'function' &&
     document.createEvent('Event').timeStamp <= performance.now()
-) {
+  ) {
     // if the event timestamp is bigger than the hi-res timestamp
     // (which is evaluated AFTER) it means the event is using a lo-res timestamp,
     // and we need to use the lo-res version for event listeners as well.
     getNow = () => performance.now()
+  }
 }
 
 /**