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diff --git a/gfx/webrender_bindings/RenderCompositorANGLE.h b/gfx/webrender_bindings/RenderCompositorANGLE.h
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+++ b/gfx/webrender_bindings/RenderCompositorANGLE.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 MOZILLA_GFX_RENDERCOMPOSITOR_ANGLE_H
+#define MOZILLA_GFX_RENDERCOMPOSITOR_ANGLE_H
+
+#include <queue>
+
+#include "GLTypes.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/webrender/RenderCompositor.h"
+#include "mozilla/webrender/RenderThread.h"
+
+struct ID3D11DeviceContext;
+struct ID3D11Device;
+struct ID3D11Query;
+struct IDXGIFactory2;
+struct IDXGISwapChain;
+struct IDXGISwapChain1;
+
+namespace mozilla {
+namespace gl {
+class GLLibraryEGL;
+}  // namespace gl
+
+namespace wr {
+
+class DCLayerTree;
+
+class RenderCompositorANGLE : public RenderCompositor {
+ public:
+  static UniquePtr<RenderCompositor> Create(
+      const RefPtr<widget::CompositorWidget>& aWidget, nsACString& aError);
+
+  explicit RenderCompositorANGLE(
+      const RefPtr<widget::CompositorWidget>& aWidget,
+      RefPtr<gl::GLContext>&& aGL);
+  virtual ~RenderCompositorANGLE();
+  bool Initialize(nsACString& aError);
+
+  bool BeginFrame() override;
+  RenderedFrameId EndFrame(const nsTArray<DeviceIntRect>& aDirtyRects) final;
+  bool WaitForGPU() override;
+  RenderedFrameId GetLastCompletedFrameId() final;
+  RenderedFrameId UpdateFrameId() final;
+  void Pause() override;
+  bool Resume() override;
+  void Update() override;
+
+  gl::GLContext* gl() const override { return mGL; }
+
+  bool MakeCurrent() override;
+
+  bool UseANGLE() const override { return true; }
+
+  bool UseDComp() const override { return !!mDCLayerTree; }
+
+  bool UseTripleBuffering() const override { return mUseTripleBuffering; }
+
+  layers::WebRenderCompositor CompositorType() const override {
+    if (UseDComp()) {
+      return layers::WebRenderCompositor::DIRECT_COMPOSITION;
+    }
+    return layers::WebRenderCompositor::DRAW;
+  }
+
+  LayoutDeviceIntSize GetBufferSize() override;
+
+  GLenum IsContextLost(bool aForce) override;
+
+  bool SurfaceOriginIsTopLeft() override { return true; }
+
+  bool SupportAsyncScreenshot() override;
+
+  bool ShouldUseNativeCompositor() override;
+
+  // Interface for wr::Compositor
+  void CompositorBeginFrame() override;
+  void CompositorEndFrame() override;
+  void Bind(wr::NativeTileId aId, wr::DeviceIntPoint* aOffset, uint32_t* aFboId,
+            wr::DeviceIntRect aDirtyRect,
+            wr::DeviceIntRect aValidRect) override;
+  void Unbind() override;
+  void CreateSurface(wr::NativeSurfaceId aId, wr::DeviceIntPoint aVirtualOffset,
+                     wr::DeviceIntSize aTileSize, bool aIsOpaque) override;
+  void CreateExternalSurface(wr::NativeSurfaceId aId, bool aIsOpaque) override;
+  void DestroySurface(NativeSurfaceId aId) override;
+  void CreateTile(wr::NativeSurfaceId aId, int32_t aX, int32_t aY) override;
+  void DestroyTile(wr::NativeSurfaceId aId, int32_t aX, int32_t aY) override;
+  void AttachExternalImage(wr::NativeSurfaceId aId,
+                           wr::ExternalImageId aExternalImage) override;
+  void AddSurface(wr::NativeSurfaceId aId,
+                  const wr::CompositorSurfaceTransform& aTransform,
+                  wr::DeviceIntRect aClipRect,
+                  wr::ImageRendering aImageRendering) override;
+  void EnableNativeCompositor(bool aEnable) override;
+  void GetCompositorCapabilities(CompositorCapabilities* aCaps) override;
+
+  // Interface for partial present
+  bool UsePartialPresent() override;
+  bool RequestFullRender() override;
+  uint32_t GetMaxPartialPresentRects() override;
+
+  bool MaybeReadback(const gfx::IntSize& aReadbackSize,
+                     const wr::ImageFormat& aReadbackFormat,
+                     const Range<uint8_t>& aReadbackBuffer,
+                     bool* aNeedsYFlip) override;
+
+ protected:
+  bool UseCompositor();
+  void InitializeUsePartialPresent();
+  void InsertGraphicsCommandsFinishedWaitQuery(
+      RenderedFrameId aRenderedFrameId);
+  bool WaitForPreviousGraphicsCommandsFinishedQuery(bool aWaitAll = false);
+  bool ResizeBufferIfNeeded();
+  bool CreateEGLSurface();
+  void DestroyEGLSurface();
+  ID3D11Device* GetDeviceOfEGLDisplay(nsACString& aError);
+  bool CreateSwapChain(nsACString& aError);
+  void CreateSwapChainForDCompIfPossible(IDXGIFactory2* aDXGIFactory2);
+  RefPtr<IDXGISwapChain1> CreateSwapChainForDComp(bool aUseTripleBuffering,
+                                                  bool aUseAlpha);
+  RefPtr<ID3D11Query> GetD3D11Query();
+  void ReleaseNativeCompositorResources();
+  HWND GetCompositorHwnd();
+
+  RefPtr<gl::GLContext> mGL;
+
+  EGLConfig mEGLConfig;
+  EGLSurface mEGLSurface;
+
+  bool mUseTripleBuffering;
+  bool mUseAlpha;
+
+  RefPtr<ID3D11Device> mDevice;
+  RefPtr<ID3D11DeviceContext> mCtx;
+  RefPtr<IDXGISwapChain> mSwapChain;
+  RefPtr<IDXGISwapChain1> mSwapChain1;
+
+  UniquePtr<DCLayerTree> mDCLayerTree;
+
+  std::queue<std::pair<RenderedFrameId, RefPtr<ID3D11Query>>>
+      mWaitForPresentQueries;
+  RefPtr<ID3D11Query> mRecycledQuery;
+  RenderedFrameId mLastCompletedFrameId;
+
+  Maybe<LayoutDeviceIntSize> mBufferSize;
+  bool mUseNativeCompositor;
+  bool mUsePartialPresent;
+  bool mFullRender;
+  // Used to know a timing of disabling native compositor.
+  bool mDisablingNativeCompositor;
+};
+
+}  // namespace wr
+}  // namespace mozilla
+
+#endif