diff -r 000000000000 -r 6474c204b198 security/sandbox/chromium/base/environment.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/security/sandbox/chromium/base/environment.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,90 @@
+// 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 BASE_ENVIRONMENT_H_
+#define BASE_ENVIRONMENT_H_
+
+#include <map>
+#include <string>
+
+#include "base/base_export.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/string16.h"
+#include "build/build_config.h"
+
+namespace base {
+
+namespace env_vars {
+
+#if defined(OS_POSIX)
+BASE_EXPORT extern const char kHome[];
+#endif
+
+}  // namespace env_vars
+
+class BASE_EXPORT Environment {
+ public:
+  virtual ~Environment();
+
+  // Static factory method that returns the implementation that provide the
+  // appropriate platform-specific instance.
+  static Environment* Create();
+
+  // Gets an environment variable's value and stores it in |result|.
+  // Returns false if the key is unset.
+  virtual bool GetVar(const char* variable_name, std::string* result) = 0;
+
+  // Syntactic sugar for GetVar(variable_name, NULL);
+  virtual bool HasVar(const char* variable_name);
+
+  // Returns true on success, otherwise returns false.
+  virtual bool SetVar(const char* variable_name,
+                      const std::string& new_value) = 0;
+
+  // Returns true on success, otherwise returns false.
+  virtual bool UnSetVar(const char* variable_name) = 0;
+};
+
+
+#if defined(OS_WIN)
+
+typedef string16 NativeEnvironmentString;
+typedef std::map<NativeEnvironmentString, NativeEnvironmentString>
+    EnvironmentMap;
+
+// 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.
+BASE_EXPORT string16 AlterEnvironment(const wchar_t* env,
+                                      const EnvironmentMap& changes);
+
+#elif defined(OS_POSIX)
+
+typedef std::string NativeEnvironmentString;
+typedef std::map<NativeEnvironmentString, NativeEnvironmentString>
+    EnvironmentMap;
+
+// 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.
+BASE_EXPORT scoped_ptr<char*[]> AlterEnvironment(
+    const char* const* env,
+    const EnvironmentMap& changes);
+
+#endif
+
+}  // namespace base
+
+#endif  // BASE_ENVIRONMENT_H_