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diff --git a/gfx/layers/basic/BasicContainerLayer.h b/gfx/layers/basic/BasicContainerLayer.h
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+++ b/gfx/layers/basic/BasicContainerLayer.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_BASICCONTAINERLAYER_H
+#define GFX_BASICCONTAINERLAYER_H
+
+#include "BasicImplData.h"     // for BasicImplData
+#include "BasicLayers.h"       // for BasicLayerManager
+#include "Layers.h"            // for Layer, ContainerLayer
+#include "nsDebug.h"           // for NS_ASSERTION
+#include "nsISupportsImpl.h"   // for MOZ_COUNT_CTOR
+#include "nsISupportsUtils.h"  // for NS_ADDREF, NS_RELEASE
+#include "mozilla/gfx/Rect.h"
+
+namespace mozilla {
+namespace layers {
+
+class BasicContainerLayer : public ContainerLayer, public BasicImplData {
+ public:
+  explicit BasicContainerLayer(BasicLayerManager* aManager)
+      : ContainerLayer(aManager, static_cast<BasicImplData*>(this)) {
+    MOZ_COUNT_CTOR(BasicContainerLayer);
+    mSupportsComponentAlphaChildren = true;
+  }
+
+ protected:
+  virtual ~BasicContainerLayer();
+
+ public:
+  void SetVisibleRegion(const LayerIntRegion& aRegion) override {
+    NS_ASSERTION(BasicManager()->InConstruction(),
+                 "Can only set properties in construction phase");
+    ContainerLayer::SetVisibleRegion(aRegion);
+  }
+  bool InsertAfter(Layer* aChild, Layer* aAfter) override {
+    if (!BasicManager()->InConstruction()) {
+      NS_ERROR("Can only set properties in construction phase");
+      return false;
+    }
+    return ContainerLayer::InsertAfter(aChild, aAfter);
+  }
+
+  bool RemoveChild(Layer* aChild) override {
+    if (!BasicManager()->InConstruction()) {
+      NS_ERROR("Can only set properties in construction phase");
+      return false;
+    }
+    return ContainerLayer::RemoveChild(aChild);
+  }
+
+  bool RepositionChild(Layer* aChild, Layer* aAfter) override {
+    if (!BasicManager()->InConstruction()) {
+      NS_ERROR("Can only set properties in construction phase");
+      return false;
+    }
+    return ContainerLayer::RepositionChild(aChild, aAfter);
+  }
+
+  void ComputeEffectiveTransforms(
+      const gfx::Matrix4x4& aTransformToSurface) override;
+
+  /**
+   * Returns true when:
+   * a) no (non-hidden) childrens' visible areas overlap in
+   * (aInRect intersected with this layer's visible region).
+   * b) the (non-hidden) childrens' visible areas cover
+   * (aInRect intersected with this layer's visible region).
+   * c) this layer and all (non-hidden) children have transforms that are
+   * translations by integers. aInRect is in the root coordinate system. Child
+   * layers with opacity do not contribute to the covered area in check b). This
+   * method can be conservative; it's OK to return false under any
+   * circumstances.
+   */
+  bool ChildrenPartitionVisibleRegion(const gfx::IntRect& aInRect);
+
+  void ForceIntermediateSurface() { mUseIntermediateSurface = true; }
+
+  void SetSupportsComponentAlphaChildren(bool aSupports) {
+    mSupportsComponentAlphaChildren = aSupports;
+  }
+
+  void Validate(LayerManager::DrawPaintedLayerCallback aCallback,
+                void* aCallbackData, ReadbackProcessor* aReadback) override;
+
+  /**
+   * We don't really have a hard restriction for max layer size, but we pick
+   * 4096 to avoid excessive memory usage.
+   */
+  int32_t GetMaxLayerSize() override { return 4096; }
+
+ protected:
+  BasicLayerManager* BasicManager() {
+    return static_cast<BasicLayerManager*>(mManager);
+  }
+};
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif