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diff --git a/gfx/layers/apz/util/ContentProcessController.h b/gfx/layers/apz/util/ContentProcessController.h
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+++ b/gfx/layers/apz/util/ContentProcessController.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_layers_ContentProcessController_h
+#define mozilla_layers_ContentProcessController_h
+
+#include "mozilla/layers/GeckoContentController.h"
+
+class nsIObserver;
+
+namespace mozilla {
+
+namespace dom {
+class BrowserChild;
+}  // namespace dom
+
+namespace layers {
+
+class APZChild;
+
+/**
+ * ContentProcessController is a GeckoContentController for a BrowserChild, and
+ * is always remoted using PAPZ/APZChild.
+ *
+ * ContentProcessController is created in ContentChild when a layer tree id has
+ * been allocated for a PBrowser that lives in that content process, and is
+ * destroyed when the Destroy message is received, or when the tab dies.
+ *
+ * If ContentProcessController needs to implement a new method on
+ * GeckoContentController PAPZ, APZChild, and RemoteContentController must be
+ * updated to handle it.
+ */
+class ContentProcessController final : public GeckoContentController {
+ public:
+  explicit ContentProcessController(const RefPtr<dom::BrowserChild>& aBrowser);
+
+  // GeckoContentController
+
+  void NotifyLayerTransforms(nsTArray<MatrixMessage>&& aTransforms) override;
+
+  void RequestContentRepaint(const RepaintRequest& aRequest) override;
+
+  void HandleTap(TapType aType, const LayoutDevicePoint& aPoint,
+                 Modifiers aModifiers, const ScrollableLayerGuid& aGuid,
+                 uint64_t aInputBlockId) override;
+
+  void NotifyPinchGesture(PinchGestureInput::PinchGestureType aType,
+                          const ScrollableLayerGuid& aGuid,
+                          const LayoutDevicePoint& aFocusPoint,
+                          LayoutDeviceCoord aSpanChange,
+                          Modifiers aModifiers) override;
+
+  void NotifyAPZStateChange(const ScrollableLayerGuid& aGuid,
+                            APZStateChange aChange, int aArg,
+                            Maybe<uint64_t> aInputBlockId) override;
+
+  void NotifyMozMouseScrollEvent(const ScrollableLayerGuid::ViewID& aScrollId,
+                                 const nsString& aEvent) override;
+
+  void NotifyFlushComplete() override;
+
+  void NotifyAsyncScrollbarDragInitiated(
+      uint64_t aDragBlockId, const ScrollableLayerGuid::ViewID& aScrollId,
+      ScrollDirection aDirection) override;
+  void NotifyAsyncScrollbarDragRejected(
+      const ScrollableLayerGuid::ViewID& aScrollId) override;
+
+  void NotifyAsyncAutoscrollRejected(
+      const ScrollableLayerGuid::ViewID& aScrollId) override;
+
+  void CancelAutoscroll(const ScrollableLayerGuid& aGuid) override;
+
+  void NotifyScaleGestureComplete(const ScrollableLayerGuid& aGuid,
+                                  float aScale) override;
+
+  bool IsRepaintThread() override;
+
+  void DispatchToRepaintThread(already_AddRefed<Runnable> aTask) override;
+
+  PresShell* GetTopLevelPresShell() const override;
+
+ private:
+  RefPtr<dom::BrowserChild> mBrowser;
+};
+
+}  // namespace layers
+
+}  // namespace mozilla
+
+#endif  // mozilla_layers_ContentProcessController_h