1 files changed, 40 insertions, 0 deletions
diff --git a/dom/workers/WorkerTestUtils.h b/dom/workers/WorkerTestUtils.h
new file mode 100644
index 0000000000..6668fdf1f7
--- /dev/null
+++ b/dom/workers/WorkerTestUtils.h
@@ -0,0 +1,40 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_WorkerTestUtils__
+#define mozilla_dom_WorkerTestUtils__
+
+namespace mozilla {
+
+class ErrorResult;
+
+namespace dom {
+
+/**
+ * dom/webidl/WorkerTestUtils.webidl defines APIs to expose worker's internal
+ * status for glass-box testing. The APIs are only exposed to Workers with prefs
+ * dom.workers.testing.enabled.
+ *
+ * WorkerTestUtils is the implementation of dom/webidl/WorkerTestUtils.webidl
+ */
+class WorkerTestUtils final {
+ public:
+  /**
+   *  Expose the worker's current timer nesting level.
+   *
+   *  The worker's current timer nesting level means the executing timer
+   *  handler's timer nesting level. When there is no executing timer handler, 0
+   *  should be returned by this API. The maximum timer nesting level is 5.
+   *
+   *  https://html.spec.whatwg.org/#timer-initialisation-steps
+   */
+  static uint32_t CurrentTimerNestingLevel(const GlobalObject&,
+                                           ErrorResult& aErr);
+};
+
+}  // namespace dom
+}  // namespace mozilla
+#endif