Atomics.wait throws when called on the main thread.

third_party/WebKit/LayoutTests/fast/workers/resources/worker-atomics-wait.js

+self.addEventListener('message', function(e) {
+    var view = e.data;
+    try {
+        Atomics.wait(view, 0, 0, 0);
+        postMessage("PASS: Atomics.wait is allowed in a worker.");
+    } catch(e) {
+        postMessage("FAIL: Atomics.wait is not allowed in a worker.");
+    }
+    postMessage("DONE");
+});