1 files changed, 51 insertions, 0 deletions
diff --git a/dom/ipc/VsyncMainChild.h b/dom/ipc/VsyncMainChild.h
new file mode 100644
index 0000000000..f5678ab0e9
--- /dev/null
+++ b/dom/ipc/VsyncMainChild.h
@@ -0,0 +1,51 @@
+/* -*- 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_VsyncMainChild_h
+#define mozilla_dom_ipc_VsyncMainChild_h
+
+#include "mozilla/dom/VsyncChild.h"
+#include "nsTObserverArray.h"
+
+namespace mozilla {
+
+class VsyncObserver;
+
+namespace dom {
+
+// The PVsyncChild actor receives a vsync event from the main process and
+// delivers it to the child process. Currently this is restricted to the main
+// thread only. The actor will stay alive until the process dies or its
+// PVsyncParent actor dies.
+class VsyncMainChild final : public VsyncChild {
+  NS_INLINE_DECL_REFCOUNTING(VsyncMainChild, override)
+
+  friend class PVsyncChild;
+
+ public:
+  VsyncMainChild();
+
+  void AddChildRefreshTimer(VsyncObserver* aVsyncObserver);
+  void RemoveChildRefreshTimer(VsyncObserver* aVsyncObserver);
+
+  TimeDuration GetVsyncRate();
+
+ private:
+  ~VsyncMainChild() override;
+
+  mozilla::ipc::IPCResult RecvNotify(const VsyncEvent& aVsync,
+                                     const float& aVsyncRate) override;
+  void ActorDestroy(ActorDestroyReason aActorDestroyReason) override;
+
+  bool mIsShutdown;
+  TimeDuration mVsyncRate;
+  nsTObserverArray<VsyncObserver*> mObservers;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_ipc_VsyncChild_h