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diff --git a/gfx/vr/service/VRService.h b/gfx/vr/service/VRService.h
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+/* -*- 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 GFX_VR_SERVICE_VRSERVICE_H
+#define GFX_VR_SERVICE_VRSERVICE_H
+
+#include "moz_external_vr.h"
+#include "base/process.h" // for base::ProcessHandle
+#include "mozilla/TimeStamp.h"
+#include "mozilla/UniquePtr.h"
+#include "nsCOMPtr.h"
+
+class nsIThread;
+namespace mozilla {
+class BackgroundHangMonitor;
+namespace gfx {
+
+class VRSession;
+class VRShMem;
+
+static const int kVRFrameTimingHistoryDepth = 100;
+
+class VRService {
+ public:
+ NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VRService)
+ static already_AddRefed<VRService> Create(
+ volatile VRExternalShmem* aShmem = nullptr);
+
+ void Refresh();
+ void Start();
+ void Stop();
+
+ private:
+ explicit VRService(volatile VRExternalShmem* aShmem);
+ ~VRService();
+
+ void StopInternal(bool aFromDtor);
+
+ bool InitShmem();
+ void PushState(const mozilla::gfx::VRSystemState& aState);
+ void PullState(mozilla::gfx::VRBrowserState& aState);
+
+ /**
+ * VRSystemState contains the most recent state of the VR
+ * system, to be shared with the browser by Shmem.
+ * mSystemState is the VR Service copy of this data, which
+ * is memcpy'ed atomically to the Shmem.
+ * VRSystemState is written by the VR Service, but read-only
+ * by the browser.
+ */
+ VRSystemState mSystemState;
+ /**
+ * VRBrowserState contains the most recent state of the browser.
+ * mBrowserState is memcpy'ed from the Shmem atomically
+ */
+ VRBrowserState mBrowserState;
+
+ UniquePtr<VRSession> mSession;
+ nsCOMPtr<nsIThread> mServiceThread;
+ // Only ever accessed on the service thread.
+ UniquePtr<mozilla::BackgroundHangMonitor> mBackgroundHangMonitor;
+
+ bool mShutdownRequested;
+
+ // Note: mShmem doesn't support RefPtr; thus, do not share this private
+ // pointer so that its lifetime can still be controlled by VRService
+ VRShMem* mShmem;
+ VRHapticState mLastHapticState[kVRHapticsMaxCount];
+ TimeStamp mFrameStartTime[kVRFrameTimingHistoryDepth];
+
+ bool IsInServiceThread();
+ void UpdateHaptics();
+
+ /**
+ * The VR Service thread is a state machine that always has one
+ * task queued depending on the state.
+ *
+ * VR Service thread state task functions:
+ */
+ void ServiceInitialize();
+ void ServiceShutdown();
+ void ServiceWaitForImmersive();
+ void ServiceImmersiveMode();
+};
+
+} // namespace gfx
+} // namespace mozilla
+
+#endif // GFX_VR_SERVICE_VRSERVICE_H