static mc -> instance mc

Author: flashdesignory

resources/shared/test-invoker.mjs

@@ -34,7 +34,10 @@ class RAFTestInvoker extends BaseRAFTestInvoker {
 }
 
 class AsyncRAFTestInvoker extends BaseRAFTestInvoker {
-    static mc = new MessageChannel();
+    constructor(syncCallback, asyncCallback, reportCallback, params) {
+        super(syncCallback, asyncCallback, reportCallback, params);
+        this.mc = new MessageChannel();
+    }
     _scheduleCallbacks(resolve) {
         let gotTimer = false;
         let gotMessage = false;
@@ -63,16 +66,16 @@ class AsyncRAFTestInvoker extends BaseRAFTestInvoker {
                 tryTriggerAsyncCallback();
             });
 
-            AsyncRAFTestInvoker.mc.port1.addEventListener(
+            this.mc.port1.addEventListener(
                 "message",
                 function () {
                     gotMessage = true;
                     tryTriggerAsyncCallback();
                 },
                 { once: true }
             );
-            AsyncRAFTestInvoker.mc.port1.start();
-            AsyncRAFTestInvoker.mc.port2.postMessage("speedometer");
+            this.mc.port1.start();
+            this.mc.port2.postMessage("speedometer");
         });
     }
 }