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diff --git a/gfx/thebes/DeviceManagerDx.h b/gfx/thebes/DeviceManagerDx.h
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+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * 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_gfx_thebes_DeviceManagerDx_h
+#define mozilla_gfx_thebes_DeviceManagerDx_h
+
+#include "gfxPlatform.h"
+#include "gfxTelemetry.h"
+#include "gfxTypes.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/gfx/GraphicsMessages.h"
+#include "nsTArray.h"
+#include "nsWindowsHelpers.h"
+
+#include <windows.h>
+#include <objbase.h>
+
+#include <d3d11.h>
+#include <dxgi.h>
+#include <dxgi1_6.h>
+
+// This header is available in the June 2010 SDK and in the Win8 SDK
+#include <d3dcommon.h>
+// Win 8.0 SDK types we'll need when building using older sdks.
+#if !defined(D3D_FEATURE_LEVEL_11_1)  // defined in the 8.0 SDK only
+#  define D3D_FEATURE_LEVEL_11_1 static_cast<D3D_FEATURE_LEVEL>(0xb100)
+#  define D3D_FL9_1_REQ_TEXTURE2D_U_OR_V_DIMENSION 2048
+#  define D3D_FL9_3_REQ_TEXTURE2D_U_OR_V_DIMENSION 4096
+#endif
+
+struct ID3D11Device;
+struct IDCompositionDevice2;
+struct IDirectDraw7;
+
+namespace mozilla {
+class ScopedGfxFeatureReporter;
+namespace layers {
+class DeviceAttachmentsD3D11;
+class MLGDevice;
+}  // namespace layers
+
+namespace gfx {
+class FeatureState;
+
+class DeviceManagerDx final {
+ public:
+  static void Init();
+  static void Shutdown();
+
+  DeviceManagerDx();
+
+  static DeviceManagerDx* Get() { return sInstance; }
+
+  RefPtr<ID3D11Device> GetCompositorDevice();
+  RefPtr<ID3D11Device> GetContentDevice();
+  RefPtr<ID3D11Device> GetCanvasDevice();
+  RefPtr<ID3D11Device> GetImageDevice();
+  RefPtr<IDCompositionDevice2> GetDirectCompositionDevice();
+  RefPtr<ID3D11Device> GetVRDevice();
+  RefPtr<ID3D11Device> CreateDecoderDevice();
+  RefPtr<layers::MLGDevice> GetMLGDevice();
+  IDirectDraw7* GetDirectDraw();
+
+  unsigned GetCompositorFeatureLevel() const;
+  bool TextureSharingWorks();
+  bool IsWARP();
+  bool CanUseNV12();
+  bool CanUseP010();
+  bool CanUseP016();
+  bool CanUseDComp();
+
+  // Returns true if we can create a texture with
+  // D3D11_RESOURCE_MISC_SHARED_KEYEDMUTEX and also
+  // upload texture data during the CreateTexture2D
+  // call. This crashes on some devices, so we might
+  // need to avoid it.
+  bool CanInitializeKeyedMutexTextures();
+
+  // Intel devices on older windows versions seem to occasionally have
+  // stability issues when supplying InitData to CreateTexture2D.
+  bool HasCrashyInitData();
+
+  // Enumerate and return all outputs on the current adapter.
+  nsTArray<DXGI_OUTPUT_DESC1> EnumerateOutputs();
+
+  // find the IDXGIOutput with a description.Monitor matching
+  // 'monitor'; returns false if not found or some error occurred.
+  bool GetOutputFromMonitor(HMONITOR monitor, RefPtr<IDXGIOutput>* aOutOutput);
+
+  // Check if the current adapter supports hardware stretching
+  void CheckHardwareStretchingSupport(HwStretchingSupport& aRv);
+
+  bool CreateCompositorDevices();
+  void CreateContentDevices();
+  void CreateDirectCompositionDevice();
+  bool CreateCanvasDevice();
+
+  static HANDLE CreateDCompSurfaceHandle();
+
+  void GetCompositorDevices(
+      RefPtr<ID3D11Device>* aOutDevice,
+      RefPtr<layers::DeviceAttachmentsD3D11>* aOutAttachments);
+
+  void ImportDeviceInfo(const D3D11DeviceStatus& aDeviceStatus);
+  void ExportDeviceInfo(D3D11DeviceStatus* aOut);
+
+  void ResetDevices();
+  void InitializeDirectDraw();
+
+  // Reset and reacquire the devices if a reset has happened.
+  // Returns whether a reset occurred not whether reacquiring
+  // was successful.
+  bool MaybeResetAndReacquireDevices();
+
+  // Test whether we can acquire a DXGI 1.2-compatible adapter. This should
+  // only be called on startup before devices are initialized.
+  bool CheckRemotePresentSupport();
+
+  // Device reset helpers.
+  bool HasDeviceReset(DeviceResetReason* aOutReason = nullptr);
+
+  // Note: these set the cached device reset reason, which will be picked up
+  // on the next frame.
+  void ForceDeviceReset(ForcedDeviceResetReason aReason);
+
+ private:
+  // Pre-load any compositor resources that are expensive, and are needed when
+  // we attempt to create a compositor.
+  static void PreloadAttachmentsOnCompositorThread();
+
+  IDXGIAdapter1* GetDXGIAdapter();
+
+  void DisableD3D11AfterCrash();
+
+  void CreateCompositorDevice(mozilla::gfx::FeatureState& d3d11);
+  bool CreateCompositorDeviceHelper(mozilla::gfx::FeatureState& aD3d11,
+                                    IDXGIAdapter1* aAdapter,
+                                    bool aAttemptVideoSupport,
+                                    RefPtr<ID3D11Device>& aOutDevice);
+
+  void CreateWARPCompositorDevice();
+  void CreateMLGDevice();
+  bool CreateVRDevice();
+
+  mozilla::gfx::FeatureStatus CreateContentDevice();
+
+  bool CreateDevice(IDXGIAdapter* aAdapter, D3D_DRIVER_TYPE aDriverType,
+                    UINT aFlags, HRESULT& aResOut,
+                    RefPtr<ID3D11Device>& aOutDevice);
+
+  bool ContentAdapterIsParentAdapter(ID3D11Device* device);
+
+  bool LoadD3D11();
+  bool LoadDcomp();
+  void ReleaseD3D11();
+
+  // Call GetDeviceRemovedReason on each device until one returns
+  // a failure.
+  bool GetAnyDeviceRemovedReason(DeviceResetReason* aOutReason);
+
+ private:
+  static StaticAutoPtr<DeviceManagerDx> sInstance;
+
+  // This is assigned during device creation. Afterwards, it is released if
+  // devices failed, and "forgotten" if devices succeeded (meaning, we leak
+  // the ref and unassign the module).
+  nsModuleHandle mD3D11Module;
+
+  nsModuleHandle mDcompModule;
+
+  mozilla::Mutex mDeviceLock;
+  nsTArray<D3D_FEATURE_LEVEL> mFeatureLevels;
+  RefPtr<IDXGIAdapter1> mAdapter;
+  RefPtr<ID3D11Device> mCompositorDevice;
+  RefPtr<ID3D11Device> mContentDevice;
+  RefPtr<ID3D11Device> mCanvasDevice;
+  RefPtr<ID3D11Device> mImageDevice;
+  RefPtr<ID3D11Device> mVRDevice;
+  RefPtr<ID3D11Device> mDecoderDevice;
+  RefPtr<IDCompositionDevice2> mDirectCompositionDevice;
+  RefPtr<layers::DeviceAttachmentsD3D11> mCompositorAttachments;
+  RefPtr<layers::MLGDevice> mMLGDevice;
+  bool mCompositorDeviceSupportsVideo;
+
+  Maybe<D3D11DeviceStatus> mDeviceStatus;
+
+  nsModuleHandle mDirectDrawDLL;
+  RefPtr<IDirectDraw7> mDirectDraw;
+
+  Maybe<DeviceResetReason> mDeviceResetReason;
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif  // mozilla_gfx_thebes_DeviceManagerDx_h