import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/workers/test/WorkerDebugger_promise_debugger.js

@@ -0,0 +1,30 @@
+"use strict";
+
+var self = this;
+
+self.onmessage = function (event) {
+  if (event.data !== "resolve") {
+    return;
+  }
+  // This then-handler should be executed inside the top-level event loop,
+  // within the context of the debugger's global.
+  Promise.resolve().then(function () {
+    var dbg = new Debugger(global);
+    dbg.onDebuggerStatement = function () {
+      self.onmessage = function (event) {
+        if (event.data !== "resume") {
+          return;
+        }
+        // This then-handler should be executed inside the nested event loop,
+        // within the context of the debugger's global.
+        Promise.resolve().then(function () {
+          postMessage("resumed");
+          leaveEventLoop();
+        });
+      };
+      postMessage("paused");
+      enterEventLoop();
+    };
+    postMessage("resolved");
+  });
+};