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diff --git a/components/policy/core/common/schema_map.h b/components/policy/core/common/schema_map.h
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+++ b/components/policy/core/common/schema_map.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_SCHEMA_MAP_H_
+#define COMPONENTS_POLICY_CORE_COMMON_SCHEMA_MAP_H_
+
+#include <map>
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "components/policy/core/common/policy_namespace.h"
+#include "components/policy/core/common/schema.h"
+#include "components/policy/policy_export.h"
+
+namespace policy {
+
+class PolicyBundle;
+
+typedef std::map<std::string, Schema> ComponentMap;
+typedef std::map<PolicyDomain, ComponentMap> DomainMap;
+
+// Contains a mapping of policy namespaces (domain + component ID) to its
+// corresponding Schema.
+class POLICY_EXPORT SchemaMap : public base::RefCountedThreadSafe<SchemaMap> {
+ public:
+  SchemaMap();
+  // Takes ownership of |map| (its contents will be swapped).
+  explicit SchemaMap(DomainMap& map);
+
+  const DomainMap& GetDomains() const;
+
+  const ComponentMap* GetComponents(PolicyDomain domain) const;
+
+  const Schema* GetSchema(const PolicyNamespace& ns) const;
+
+  // Removes all the policies in |bundle| that don't match the known schemas.
+  // Unknown components are also dropped.
+  void FilterBundle(PolicyBundle* bundle) const;
+
+  // Returns true if this map contains at least one component of a domain other
+  // than POLICY_DOMAIN_CHROME.
+  bool HasComponents() const;
+
+  void GetChanges(const scoped_refptr<SchemaMap>& older,
+                  PolicyNamespaceList* removed,
+                  PolicyNamespaceList* added) const;
+
+ private:
+  friend class base::RefCountedThreadSafe<SchemaMap>;
+
+  void GetNamespacesNotInOther(const SchemaMap* other,
+                               PolicyNamespaceList* list) const;
+
+  ~SchemaMap();
+
+  DomainMap map_;
+
+  DISALLOW_COPY_AND_ASSIGN(SchemaMap);
+};
+
+}  // namespace policy
+
+#endif  // COMPONENTS_POLICY_CORE_COMMON_SCHEMA_MAP_H_