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diff --git a/ipc/glue/ProcessUtils.h b/ipc/glue/ProcessUtils.h
new file mode 100644
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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_ipc_ProcessUtils_h
+#define mozilla_ipc_ProcessUtils_h
+
+#include <functional>
+#include <vector>
+
+#include "mozilla/ipc/FileDescriptor.h"
+#include "base/shared_memory.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/Preferences.h"
+#include "nsXULAppAPI.h"
+
+namespace mozilla {
+namespace ipc {
+
+class GeckoChildProcessHost;
+
+// You probably should call ContentChild::SetProcessName instead of calling
+// this directly.
+void SetThisProcessName(const char* aName);
+
+class SharedPreferenceSerializer final {
+ public:
+  explicit SharedPreferenceSerializer();
+  SharedPreferenceSerializer(SharedPreferenceSerializer&& aOther);
+  ~SharedPreferenceSerializer();
+
+  bool SerializeToSharedMemory(const GeckoProcessType aDestinationProcessType,
+                               const nsACString& aDestinationRemoteType);
+
+  size_t GetPrefMapSize() const { return mPrefMapSize; }
+  size_t GetPrefsLength() const { return mPrefsLength; }
+
+  const UniqueFileHandle& GetPrefsHandle() const { return mPrefsHandle; }
+
+  const UniqueFileHandle& GetPrefMapHandle() const { return mPrefMapHandle; }
+
+  void AddSharedPrefCmdLineArgs(GeckoChildProcessHost& procHost,
+                                std::vector<std::string>& aExtraOpts) const;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SharedPreferenceSerializer);
+  size_t mPrefMapSize;
+  size_t mPrefsLength;
+  UniqueFileHandle mPrefMapHandle;
+  UniqueFileHandle mPrefsHandle;
+};
+
+class SharedPreferenceDeserializer final {
+ public:
+  SharedPreferenceDeserializer();
+  ~SharedPreferenceDeserializer();
+
+  bool DeserializeFromSharedMemory(uint64_t aPrefsHandle,
+                                   uint64_t aPrefMapHandle, uint64_t aPrefsLen,
+                                   uint64_t aPrefMapSize);
+
+  const FileDescriptor& GetPrefMapHandle() const;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SharedPreferenceDeserializer);
+  Maybe<FileDescriptor> mPrefMapHandle;
+  Maybe<size_t> mPrefsLen;
+  Maybe<size_t> mPrefMapSize;
+  base::SharedMemory mShmem;
+};
+
+#ifdef ANDROID
+// Android doesn't use -prefsHandle or -prefMapHandle. It gets those FDs
+// another way.
+void SetPrefsFd(int aFd);
+void SetPrefMapFd(int aFd);
+#endif
+
+// Generate command line argument to spawn a child process. If the shared memory
+// is not properly initialized, this would be a no-op.
+void ExportSharedJSInit(GeckoChildProcessHost& procHost,
+                        std::vector<std::string>& aExtraOpts);
+
+// Initialize the content used by the JS engine during the initialization of a
+// JS::Runtime.
+bool ImportSharedJSInit(uint64_t aJsInitHandle, uint64_t aJsInitLen);
+
+}  // namespace ipc
+}  // namespace mozilla
+
+#endif  // ifndef mozilla_ipc_ProcessUtils_h