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diff --git a/gfx/vr/VRDisplayClient.h b/gfx/vr/VRDisplayClient.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_DISPLAY_CLIENT_H
+#define GFX_VR_DISPLAY_CLIENT_H
+
+#include "nsCOMPtr.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/dom/VRDisplayBinding.h"
+
+#include "gfxVR.h"
+
+namespace mozilla {
+namespace dom {
+enum class XRReferenceSpaceType : uint8_t;
+class XRSession;
+} // namespace dom
+namespace gfx {
+class VRDisplayPresentation;
+class VRManagerChild;
+
+class VRDisplayClient {
+ public:
+ NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VRDisplayClient)
+
+ explicit VRDisplayClient(const VRDisplayInfo& aDisplayInfo);
+
+ MOZ_CAN_RUN_SCRIPT void UpdateDisplayInfo(const VRDisplayInfo& aDisplayInfo);
+ void UpdateSubmitFrameResult(const VRSubmitFrameResultInfo& aResult);
+
+ const VRDisplayInfo& GetDisplayInfo() const { return mDisplayInfo; }
+ virtual const VRHMDSensorState& GetSensorState() const;
+ void GetSubmitFrameResult(VRSubmitFrameResultInfo& aResult);
+
+ already_AddRefed<VRDisplayPresentation> BeginPresentation(
+ const nsTArray<dom::VRLayer>& aLayers, uint32_t aGroup);
+ void PresentationCreated();
+ void PresentationDestroyed();
+
+ void SessionStarted(dom::XRSession* aSession);
+ void SessionEnded(dom::XRSession* aSession);
+
+ bool GetIsConnected() const;
+
+ void NotifyDisconnected();
+ void SetGroupMask(uint32_t aGroupMask);
+
+ bool IsPresentationGenerationCurrent() const;
+ void MakePresentationGenerationCurrent();
+
+ void StartVRNavigation();
+ void StopVRNavigation(const TimeDuration& aTimeout);
+
+ bool IsPresenting();
+ bool IsReferenceSpaceTypeSupported(dom::XRReferenceSpaceType aType) const;
+ gfx::VRAPIMode GetXRAPIMode() const;
+ void SetXRAPIMode(gfx::VRAPIMode aMode);
+
+ protected:
+ virtual ~VRDisplayClient();
+
+ MOZ_CAN_RUN_SCRIPT void FireEvents();
+ void FireGamepadEvents();
+ MOZ_CAN_RUN_SCRIPT void StartFrame();
+
+ VRDisplayInfo mDisplayInfo;
+
+ bool bLastEventWasMounted;
+ bool bLastEventWasPresenting;
+
+ int mPresentationCount;
+ uint64_t mLastEventFrameId;
+ uint32_t mLastPresentingGeneration;
+
+ // Difference between mDisplayInfo.mControllerState and
+ // mLastEventControllerState determines what gamepad events to fire when
+ // updated.
+ VRControllerState mLastEventControllerState[kVRControllerMaxCount];
+
+ /**
+ * mSessions is cleared in VRDisplayClient::SessionEnded.
+ * SessionEnded is guaranteed to be called by every XRSession
+ * when it is shutdown explicitly with the WebXR XRSession.end
+ * call, when all JS references on the XRSession are released, or
+ * when the window is closed.
+ */
+ nsTArray<RefPtr<dom::XRSession>> mSessions;
+
+ private:
+ void GamepadMappingForWebVR(VRControllerState& aControllerState);
+
+ VRSubmitFrameResultInfo mSubmitFrameResult;
+ gfx::VRAPIMode mAPIMode;
+};
+
+} // namespace gfx
+} // namespace mozilla
+
+#endif /* GFX_VR_DISPLAY_CLIENT_H */