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diff --git a/ipc/glue/EnvironmentMap.h b/ipc/glue/EnvironmentMap.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: */
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SANDBOXING_COMMON_ENVIRONMENTMAP_H_
+#define SANDBOXING_COMMON_ENVIRONMENTMAP_H_
+
+#include <map>
+#include <memory>
+#include <string>
+
+namespace base {
+
+#if defined(XP_WIN)
+
+typedef std::wstring NativeEnvironmentString;
+typedef std::map<NativeEnvironmentString, NativeEnvironmentString>
+    EnvironmentMap;
+
+#  define ENVIRONMENT_LITERAL(x) L##x
+#  define ENVIRONMENT_STRING(x) \
+    ((std::wstring)(NS_ConvertUTF8toUTF16((x)).get()))
+
+// Returns a modified environment vector constructed from the given environment
+// and the list of changes given in |changes|. Each key in the environment is
+// matched against the first element of the pairs. In the event of a match, the
+// value is replaced by the second of the pair, unless the second is empty, in
+// which case the key-value is removed.
+//
+// This Windows version takes and returns a Windows-style environment block
+// which is a concatenated list of null-terminated 16-bit strings. The end is
+// marked by a double-null terminator. The size of the returned string will
+// include the terminators.
+NativeEnvironmentString AlterEnvironment(const wchar_t* env,
+                                         const EnvironmentMap& changes);
+
+#else
+
+typedef std::string NativeEnvironmentString;
+typedef std::map<NativeEnvironmentString, NativeEnvironmentString>
+    EnvironmentMap;
+
+#  define ENVIRONMENT_LITERAL(x) x
+#  define ENVIRONMENT_STRING(x) x
+
+// See general comments for the Windows version above.
+//
+// This Posix version takes and returns a Posix-style environment block, which
+// is a null-terminated list of pointers to null-terminated strings. The
+// returned array will have appended to it the storage for the array itself so
+// there is only one pointer to manage, but this means that you can't copy the
+// array without keeping the original around.
+std::unique_ptr<char*[]> AlterEnvironment(const char* const* env,
+                                          const EnvironmentMap& changes);
+
+#endif
+
+}  // namespace base
+
+#endif  // SANDBOXING_COMMON_ENVIRONMENTMAP_H_