1 files changed, 52 insertions, 0 deletions
diff --git a/dom/ipc/VsyncWorkerChild.h b/dom/ipc/VsyncWorkerChild.h
new file mode 100644
index 0000000000..e34555936d
--- /dev/null
+++ b/dom/ipc/VsyncWorkerChild.h
@@ -0,0 +1,52 @@
+/* -*- 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_ipc_VsyncWorkerChild_h
+#define mozilla_dom_ipc_VsyncWorkerChild_h
+
+#include "mozilla/dom/VsyncChild.h"
+#include "mozilla/RefPtr.h"
+#include "nsISupportsImpl.h"
+
+namespace mozilla::dom {
+class DedicatedWorkerGlobalScope;
+class IPCWorkerRef;
+class WorkerPrivate;
+
+// The PVsyncWorkerChild actor receives a vsync event from the main process and
+// delivers it to the child process. This is specific for workers which wish to
+// subscribe to vsync events to drive requestAnimationFrame callbacks.
+class VsyncWorkerChild final : public VsyncChild {
+  NS_INLINE_DECL_REFCOUNTING(VsyncWorkerChild, override)
+
+  friend class PVsyncChild;
+
+ public:
+  VsyncWorkerChild();
+
+  bool Initialize(WorkerPrivate* aWorkerPrivate);
+
+  void Destroy();
+
+  void TryObserve();
+
+  void TryUnobserve();
+
+ private:
+  ~VsyncWorkerChild() override;
+
+  mozilla::ipc::IPCResult RecvNotify(const VsyncEvent& aVsync,
+                                     const float& aVsyncRate) override;
+
+  void ActorDestroy(ActorDestroyReason aActorDestroyReason) override;
+
+  RefPtr<IPCWorkerRef> mWorkerRef;
+  bool mObserving = false;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_ipc_VsyncWorkerChild_h