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diff --git a/base/env_var.h b/base/env_var.h
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+// Copyright (c) 2010 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_ENV_VAR_H_
+#define BASE_ENV_VAR_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+
+namespace base {
+
+// These are used to derive mocks for unittests.
+class EnvVarGetter {
+ public:
+  virtual ~EnvVarGetter() {}
+  // Gets an environment variable's value and stores it in |result|.
+  // Returns false if the key is unset.
+  virtual bool GetEnv(const char* variable_name, std::string* result) = 0;
+
+  // Syntactic sugar for GetEnv(variable_name, NULL);
+  virtual bool HasEnv(const char* variable_name) {
+    return GetEnv(variable_name, NULL);
+  }
+
+  // Create an instance of EnvVarGetter
+  static EnvVarGetter* Create();
+};
+
+}  // namespace base
+
+#endif  // BASE_ENV_VAR_H_