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diff --git a/gfx/layers/ipc/APZChild.h b/gfx/layers/ipc/APZChild.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_APZChild_h
+#define mozilla_layers_APZChild_h
+
+#include "mozilla/layers/PAPZChild.h"
+#include "mozilla/layers/APZTaskRunnable.h"
+
+namespace mozilla {
+namespace layers {
+
+class GeckoContentController;
+
+/**
+ * APZChild implements PAPZChild and is used to remote a GeckoContentController
+ * that lives in a different process than where APZ lives.
+ */
+class APZChild final : public PAPZChild {
+ public:
+ using APZStateChange = GeckoContentController_APZStateChange;
+
+ explicit APZChild(RefPtr<GeckoContentController> aController);
+ virtual ~APZChild();
+
+ mozilla::ipc::IPCResult RecvLayerTransforms(
+ nsTArray<MatrixMessage>&& aTransforms);
+
+ mozilla::ipc::IPCResult RecvRequestContentRepaint(
+ const RepaintRequest& aRequest);
+
+ mozilla::ipc::IPCResult RecvUpdateOverscrollVelocity(
+ const ScrollableLayerGuid& aGuid, const float& aX, const float& aY,
+ const bool& aIsRootContent);
+
+ mozilla::ipc::IPCResult RecvUpdateOverscrollOffset(
+ const ScrollableLayerGuid& aGuid, const float& aX, const float& aY,
+ const bool& aIsRootContent);
+
+ mozilla::ipc::IPCResult RecvNotifyMozMouseScrollEvent(const ViewID& aScrollId,
+ const nsString& aEvent);
+
+ mozilla::ipc::IPCResult RecvNotifyAPZStateChange(
+ const ScrollableLayerGuid& aGuid, const APZStateChange& aChange,
+ const int& aArg, Maybe<uint64_t> aInputBlockId);
+
+ mozilla::ipc::IPCResult RecvNotifyFlushComplete();
+
+ mozilla::ipc::IPCResult RecvNotifyAsyncScrollbarDragInitiated(
+ const uint64_t& aDragBlockId, const ViewID& aScrollId,
+ const ScrollDirection& aDirection);
+ mozilla::ipc::IPCResult RecvNotifyAsyncScrollbarDragRejected(
+ const ViewID& aScrollId);
+
+ mozilla::ipc::IPCResult RecvNotifyAsyncAutoscrollRejected(
+ const ViewID& aScrollId);
+
+ mozilla::ipc::IPCResult RecvDestroy();
+
+ private:
+ void EnsureAPZTaskRunnable() {
+ if (!mAPZTaskRunnable) {
+ mAPZTaskRunnable = new APZTaskRunnable(mController);
+ }
+ }
+
+ RefPtr<GeckoContentController> mController;
+ // A runnable invoked in a nsRefreshDriver's tick to update multiple
+ // RepaintRequests and notify a "apz-repaints-flushed" at the same time.
+ RefPtr<APZTaskRunnable> mAPZTaskRunnable;
+};
+
+} // namespace layers
+} // namespace mozilla
+
+#endif // mozilla_layers_APZChild_h