1 files changed, 79 insertions, 0 deletions
diff --git a/gfx/layers/ipc/APZChild.h b/gfx/layers/ipc/APZChild.h
new file mode 100644
index 0000000000..67584eb7ff
--- /dev/null
+++ b/gfx/layers/ipc/APZChild.h
@@ -0,0 +1,79 @@
+/* -*- 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);
+
+  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