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diff --git a/dom/webbrowserpersist/WebBrowserPersistDocumentParent.h b/dom/webbrowserpersist/WebBrowserPersistDocumentParent.h
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * 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 WebBrowserPersistDocumentParent_h__
+#define WebBrowserPersistDocumentParent_h__
+
+#include "mozilla/Maybe.h"
+#include "mozilla/PWebBrowserPersistDocumentParent.h"
+#include "nsCOMPtr.h"
+#include "nsIWebBrowserPersistDocument.h"
+
+// This class is the IPC half of the glue between the
+// nsIWebBrowserPersistDocument interface and a remote document. When
+// (and if) it receives the Attributes message it constructs an
+// WebBrowserPersistRemoteDocument and releases it into the XPCOM
+// universe; otherwise, it invokes the document receiver's error
+// callback.
+//
+// This object's lifetime is the normal IPC lifetime; on destruction,
+// it calls its XPCOM reflection (if it exists yet) to remove that
+// reference. Normal deletion occurs when the XPCOM object is being
+// destroyed or after an InitFailure is received and handled.
+//
+// See also: BrowserParent::StartPersistence.
+
+namespace mozilla {
+
+class WebBrowserPersistRemoteDocument;
+
+class WebBrowserPersistDocumentParent final
+ : public PWebBrowserPersistDocumentParent {
+ public:
+ WebBrowserPersistDocumentParent();
+ virtual ~WebBrowserPersistDocumentParent();
+
+ // Set a callback to be invoked when the actor leaves the START
+ // state. This method must be called exactly once while the actor
+ // is still in the START state (or is unconstructed).
+ void SetOnReady(nsIWebBrowserPersistDocumentReceiver* aOnReady);
+
+ using Attrs = WebBrowserPersistDocumentAttrs;
+
+ // IPDL methods:
+ mozilla::ipc::IPCResult RecvAttributes(const Attrs& aAttrs,
+ const Maybe<IPCStream>& aPostStream);
+ mozilla::ipc::IPCResult RecvInitFailure(const nsresult& aFailure);
+
+ PWebBrowserPersistResourcesParent* AllocPWebBrowserPersistResourcesParent();
+ bool DeallocPWebBrowserPersistResourcesParent(
+ PWebBrowserPersistResourcesParent* aActor);
+
+ PWebBrowserPersistSerializeParent* AllocPWebBrowserPersistSerializeParent(
+ const WebBrowserPersistURIMap& aMap,
+ const nsACString& aRequestedContentType, const uint32_t& aEncoderFlags,
+ const uint32_t& aWrapColumn);
+ bool DeallocPWebBrowserPersistSerializeParent(
+ PWebBrowserPersistSerializeParent* aActor);
+
+ virtual void ActorDestroy(ActorDestroyReason aWhy) override;
+
+ private:
+ // This is reset to nullptr when the callback is invoked.
+ nsCOMPtr<nsIWebBrowserPersistDocumentReceiver> mOnReady;
+ WebBrowserPersistRemoteDocument* mReflection;
+};
+
+} // namespace mozilla
+
+#endif // WebBrowserPersistDocumentParent_h__