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diff --git a/gfx/layers/composite/ContainerLayerComposite.h b/gfx/layers/composite/ContainerLayerComposite.h
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+++ b/gfx/layers/composite/ContainerLayerComposite.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_ContainerLayerComposite_H
+#define GFX_ContainerLayerComposite_H
+
+#include "Layers.h"              // for Layer (ptr only), etc
+#include "mozilla/Attributes.h"  // for override
+#include "mozilla/UniquePtr.h"   // for UniquePtr
+#include "mozilla/layers/LayerManagerComposite.h"
+#include "mozilla/gfx/Rect.h"
+
+namespace mozilla {
+namespace layers {
+
+class APZSampler;
+class CompositableHost;
+class CompositingRenderTarget;
+struct PreparedData;
+
+class ContainerLayerComposite : public ContainerLayer, public LayerComposite {
+  template <class ContainerT>
+  friend void ContainerPrepare(ContainerT* aContainer,
+                               LayerManagerComposite* aManager,
+                               const RenderTargetIntRect& aClipRect);
+  template <class ContainerT>
+  friend void ContainerRender(ContainerT* aContainer,
+                              LayerManagerComposite* aManager,
+                              const RenderTargetIntRect& aClipRect,
+                              const Maybe<gfx::Polygon>& aGeometry);
+  template <class ContainerT>
+  friend void RenderLayers(ContainerT* aContainer,
+                           LayerManagerComposite* aManager,
+                           const RenderTargetIntRect& aClipRect,
+                           const Maybe<gfx::Polygon>& aGeometry);
+  template <class ContainerT>
+  friend void RenderIntermediate(ContainerT* aContainer,
+                                 LayerManagerComposite* aManager,
+                                 const gfx::IntRect& aClipRect,
+                                 RefPtr<CompositingRenderTarget> surface);
+  template <class ContainerT>
+  friend RefPtr<CompositingRenderTarget>
+  CreateTemporaryTargetAndCopyFromBackground(
+      ContainerT* aContainer, LayerManagerComposite* aManager,
+      const RenderTargetIntRect& aClipRect);
+  template <class ContainerT>
+  friend RefPtr<CompositingRenderTarget> CreateOrRecycleTarget(
+      ContainerT* aContainer, LayerManagerComposite* aManager,
+      const RenderTargetIntRect& aClipRect);
+
+  template <class ContainerT>
+  void RenderMinimap(ContainerT* aContainer, const RefPtr<APZSampler>& aSampler,
+                     LayerManagerComposite* aManager,
+                     const RenderTargetIntRect& aClipRect, Layer* aLayer);
+
+ public:
+  explicit ContainerLayerComposite(LayerManagerComposite* aManager);
+
+ protected:
+  virtual ~ContainerLayerComposite();
+
+ public:
+  // LayerComposite Implementation
+  Layer* GetLayer() override { return this; }
+
+  void SetLayerManager(HostLayerManager* aManager) override {
+    LayerComposite::SetLayerManager(aManager);
+    mManager = aManager;
+    mLastIntermediateSurface = nullptr;
+  }
+
+  void Destroy() override;
+
+  LayerComposite* GetFirstChildComposite() override;
+
+  void Cleanup() override;
+
+  void RenderLayer(const gfx::IntRect& aClipRect,
+                   const Maybe<gfx::Polygon>& aGeometry) override;
+
+  void Prepare(const RenderTargetIntRect& aClipRect) override;
+
+  void ComputeEffectiveTransforms(
+      const gfx::Matrix4x4& aTransformToSurface) override {
+    DefaultComputeEffectiveTransforms(aTransformToSurface);
+  }
+
+  const LayerIntRegion& GetShadowVisibleRegion() override;
+
+  void CleanupResources() override;
+
+  HostLayer* AsHostLayer() override { return this; }
+
+  // container layers don't use a compositable
+  CompositableHost* GetCompositableHost() override { return nullptr; }
+
+  // If the layer has a pres shell resolution, add a post-scale
+  // to the layer's transform equal to the pres shell resolution we're
+  // scaling to. This cancels out the post scale of '1 / resolution'
+  // added by Layout. TODO: It would be nice to get rid of both of these
+  // post-scales.
+  float GetPostXScale() const override {
+    return mSimpleAttrs.GetPostXScale() * mPresShellResolution;
+  }
+  float GetPostYScale() const override {
+    return mSimpleAttrs.GetPostYScale() * mPresShellResolution;
+  }
+
+  const char* Name() const override { return "ContainerLayerComposite"; }
+  UniquePtr<PreparedData> mPrepared;
+
+  RefPtr<CompositingRenderTarget> mLastIntermediateSurface;
+};
+
+class RefLayerComposite : public RefLayer, public LayerComposite {
+  template <class ContainerT>
+  friend void ContainerPrepare(ContainerT* aContainer,
+                               LayerManagerComposite* aManager,
+                               const RenderTargetIntRect& aClipRect);
+  template <class ContainerT>
+  friend void ContainerRender(ContainerT* aContainer,
+                              LayerManagerComposite* aManager,
+                              const gfx::IntRect& aClipRect,
+                              const Maybe<gfx::Polygon>& aGeometry);
+  template <class ContainerT>
+  friend void RenderLayers(ContainerT* aContainer,
+                           LayerManagerComposite* aManager,
+                           const gfx::IntRect& aClipRect,
+                           const Maybe<gfx::Polygon>& aGeometry);
+  template <class ContainerT>
+  friend void RenderIntermediate(ContainerT* aContainer,
+                                 LayerManagerComposite* aManager,
+                                 const gfx::IntRect& aClipRect,
+                                 RefPtr<CompositingRenderTarget> surface);
+  template <class ContainerT>
+  friend RefPtr<CompositingRenderTarget>
+  CreateTemporaryTargetAndCopyFromBackground(ContainerT* aContainer,
+                                             LayerManagerComposite* aManager,
+                                             const gfx::IntRect& aClipRect);
+  template <class ContainerT>
+  friend RefPtr<CompositingRenderTarget> CreateTemporaryTarget(
+      ContainerT* aContainer, LayerManagerComposite* aManager,
+      const gfx::IntRect& aClipRect);
+
+ public:
+  explicit RefLayerComposite(LayerManagerComposite* aManager);
+
+ protected:
+  virtual ~RefLayerComposite();
+
+ public:
+  /** LayerOGL implementation */
+  Layer* GetLayer() override { return this; }
+
+  void SetLayerManager(HostLayerManager* aManager) override {
+    LayerComposite::SetLayerManager(aManager);
+    mManager = aManager;
+    mLastIntermediateSurface = nullptr;
+  }
+
+  void Destroy() override;
+
+  LayerComposite* GetFirstChildComposite() override;
+
+  void RenderLayer(const gfx::IntRect& aClipRect,
+                   const Maybe<gfx::Polygon>& aGeometry) override;
+
+  void Prepare(const RenderTargetIntRect& aClipRect) override;
+
+  void ComputeEffectiveTransforms(
+      const gfx::Matrix4x4& aTransformToSurface) override {
+    DefaultComputeEffectiveTransforms(aTransformToSurface);
+  }
+
+  const LayerIntRegion& GetShadowVisibleRegion() override;
+
+  void Cleanup() override;
+
+  void CleanupResources() override;
+
+  HostLayer* AsHostLayer() override { return this; }
+
+  // ref layers don't use a compositable
+  CompositableHost* GetCompositableHost() override { return nullptr; }
+
+  const char* Name() const override { return "RefLayerComposite"; }
+  UniquePtr<PreparedData> mPrepared;
+  RefPtr<CompositingRenderTarget> mLastIntermediateSurface;
+};
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif /* GFX_ContainerLayerComposite_H */