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diff --git a/dom/cache/AutoUtils.h b/dom/cache/AutoUtils.h
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+++ b/dom/cache/AutoUtils.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_dom_cache_AutoUtils_h
+#define mozilla_dom_cache_AutoUtils_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/SafeRefPtr.h"
+#include "mozilla/dom/cache/CacheTypes.h"
+#include "mozilla/dom/cache/Types.h"
+#include "mozilla/dom/cache/TypeUtils.h"
+#include "nsTArray.h"
+
+struct nsID;
+
+namespace mozilla {
+
+class ErrorResult;
+
+namespace ipc {
+class PBackgroundParent;
+}  // namespace ipc
+
+namespace dom {
+
+class InternalRequest;
+
+namespace cache {
+
+class CacheStreamControlParent;
+class Manager;
+struct SavedRequest;
+struct SavedResponse;
+class StreamList;
+
+// A collection of RAII-style helper classes to ensure that IPC
+// FileDescriptorSet actors are properly cleaned up.  The user of these actors
+// must manually either Forget() the Fds or Send__delete__() the actor
+// depending on if the descriptors were actually sent.
+//
+// Note, these should only be used when *sending* streams across IPC.  The
+// deserialization case is handled by creating a ReadStream object.
+
+class MOZ_STACK_CLASS AutoChildOpArgs final {
+ public:
+  using BodyAction = TypeUtils::BodyAction;
+  using SchemeAction = TypeUtils::SchemeAction;
+
+  AutoChildOpArgs(TypeUtils* aTypeUtils, const CacheOpArgs& aOpArgs,
+                  uint32_t aEntryCount);
+  ~AutoChildOpArgs();
+
+  void Add(const InternalRequest& aRequest, BodyAction aBodyAction,
+           SchemeAction aSchemeAction, ErrorResult& aRv);
+  void Add(JSContext* aCx, const InternalRequest& aRequest,
+           BodyAction aBodyAction, SchemeAction aSchemeAction,
+           Response& aResponse, ErrorResult& aRv);
+
+  const CacheOpArgs& SendAsOpArgs();
+
+ private:
+  TypeUtils* mTypeUtils;
+  CacheOpArgs mOpArgs;
+  bool mSent;
+};
+
+class MOZ_STACK_CLASS AutoParentOpResult final {
+ public:
+  AutoParentOpResult(mozilla::ipc::PBackgroundParent* aManager,
+                     const CacheOpResult& aOpResult, uint32_t aEntryCount);
+  ~AutoParentOpResult();
+
+  void Add(CacheId aOpenedCacheId, SafeRefPtr<Manager> aManager);
+  void Add(const SavedResponse& aSavedResponse, StreamList& aStreamList);
+  void Add(const SavedRequest& aSavedRequest, StreamList& aStreamList);
+
+  const CacheOpResult& SendAsOpResult();
+
+ private:
+  void SerializeResponseBody(const SavedResponse& aSavedResponse,
+                             StreamList& aStreamList,
+                             CacheResponse* aResponseOut);
+
+  void SerializeReadStream(const nsID& aId, StreamList& aStreamList,
+                           CacheReadStream* aReadStreamOut);
+
+  mozilla::ipc::PBackgroundParent* mManager;
+  CacheOpResult mOpResult;
+  CacheStreamControlParent* mStreamControl;
+  bool mSent;
+};
+
+}  // namespace cache
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_cache_AutoUtils_h