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diff --git a/chromium/components/policy/core/common/policy_namespace.h b/chromium/components/policy/core/common/policy_namespace.h
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+++ b/chromium/components/policy/core/common/policy_namespace.h
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+// Copyright 2013 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 COMPONENTS_POLICY_CORE_COMMON_POLICY_NAMESPACE_H_
+#define COMPONENTS_POLICY_CORE_COMMON_POLICY_NAMESPACE_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <string>
+#include <vector>
+
+#include "components/policy/policy_export.h"
+
+namespace policy {
+
+// Policies are namespaced by a (PolicyDomain, ID) pair. The meaning of the ID
+// string depends on the domain; for example, if the PolicyDomain is
+// "extensions" then the ID identifies the extension that the policies control.
+enum PolicyDomain {
+  // The component ID for chrome policies is always the empty string.
+  POLICY_DOMAIN_CHROME,
+
+  // The component ID for the extension policies is equal to the extension ID.
+  POLICY_DOMAIN_EXTENSIONS,
+
+  // The namespace that corresponds to the policies for extensions running
+  // under Chrome OS signin profile. The component ID is equal to the extension
+  // ID.
+  POLICY_DOMAIN_SIGNIN_EXTENSIONS,
+
+  // Must be the last entry.
+  POLICY_DOMAIN_SIZE,
+};
+
+// Groups a policy domain and a component ID in a single object representing
+// a policy namespace. Objects of this class can be used as keys in std::maps.
+struct POLICY_EXPORT PolicyNamespace {
+  PolicyNamespace();
+  PolicyNamespace(PolicyDomain domain, const std::string& component_id);
+  PolicyNamespace(const PolicyNamespace& other);
+  ~PolicyNamespace();
+
+  PolicyNamespace& operator=(const PolicyNamespace& other);
+  bool operator<(const PolicyNamespace& other) const;
+  bool operator==(const PolicyNamespace& other) const;
+  bool operator!=(const PolicyNamespace& other) const;
+
+  PolicyDomain domain;
+  std::string component_id;
+};
+
+typedef std::vector<PolicyNamespace> PolicyNamespaceList;
+
+struct PolicyNamespaceHash {
+  size_t operator()(const policy::PolicyNamespace& ns) const {
+    return std::hash<std::string>()(ns.component_id) ^
+           (UINT64_C(1) << ns.domain);
+  }
+};
+
+}  // namespace policy
+
+#endif  // COMPONENTS_POLICY_CORE_COMMON_POLICY_NAMESPACE_H_