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diff --git a/gfx/webrender_bindings/RenderExternalTextureHost.h b/gfx/webrender_bindings/RenderExternalTextureHost.h
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+++ b/gfx/webrender_bindings/RenderExternalTextureHost.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_RENDEREXTERNALTEXTUREHOST_H
+#define MOZILLA_GFX_RENDEREXTERNALTEXTUREHOST_H
+
+#include "mozilla/layers/TextureHostOGL.h"
+#include "RenderTextureHostSWGL.h"
+
+namespace mozilla {
+namespace wr {
+
+/**
+ * RenderExternalTextureHost manages external textures used by WebRender on Mac.
+ * The motivation for this is to be able to use Apple Client Storage OpenGL
+ * extension, which makes it possible to avoid some copies during texture
+ * upload. This is especially helpful for high resolution video.
+ */
+class RenderExternalTextureHost final : public RenderTextureHostSWGL {
+ public:
+  RenderExternalTextureHost(uint8_t* aBuffer,
+                            const layers::BufferDescriptor& aDescriptor);
+
+  wr::WrExternalImage Lock(uint8_t aChannelIndex, gl::GLContext* aGL) override;
+  void Unlock() override;
+  void PrepareForUse() override;
+  size_t Bytes() override {
+    return mSize.width * mSize.height * BytesPerPixel(mFormat);
+  }
+
+  // RenderTextureHostSWGL
+  size_t GetPlaneCount() const override;
+
+  gfx::SurfaceFormat GetFormat() const override;
+
+  gfx::ColorDepth GetColorDepth() const override;
+
+  gfx::YUVRangedColorSpace GetYUVColorSpace() const override;
+
+  bool MapPlane(RenderCompositor* aCompositor, uint8_t aChannelIndex,
+                PlaneInfo& aPlaneInfo) override;
+
+  void UnmapPlanes() override;
+
+ private:
+  ~RenderExternalTextureHost();
+
+  bool CreateSurfaces();
+  void DeleteSurfaces();
+  void DeleteTextures();
+
+  uint8_t* GetBuffer() const { return mBuffer; }
+  bool InitializeIfNeeded();
+  bool IsReadyForDeletion();
+  bool IsYUV() const { return mFormat == gfx::SurfaceFormat::YUV; }
+  size_t PlaneCount() const { return IsYUV() ? 3 : 1; }
+  void UpdateTexture(size_t aIndex);
+  void UpdateTextures();
+
+  uint8_t* mBuffer;
+  layers::BufferDescriptor mDescriptor;
+
+  bool mInitialized;
+  bool mTextureUpdateNeeded;
+
+  gfx::IntSize mSize;
+  gfx::SurfaceFormat mFormat;
+
+  RefPtr<gl::GLContext> mGL;
+  RefPtr<gfx::DataSourceSurface> mSurfaces[3];
+  RefPtr<layers::DirectMapTextureSource> mTextureSources[3];
+  wr::WrExternalImage mImages[3];
+};
+
+}  // namespace wr
+}  // namespace mozilla
+
+#endif  // MOZILLA_GFX_RENDEREXTERNALTEXTUREHOST_H