Added new policy Schema classes.

components/policy/core/common/schema_internal.h

+// 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_INTERNAL_H_
+#define COMPONENTS_POLICY_CORE_COMMON_SCHEMA_INTERNAL_H_
+
+#include "base/values.h"
+#include "components/policy/policy_export.h"
+
+namespace policy {
+namespace internal {
+
+// These types are used internally by the SchemaOwner parser, and by the
+// compile-time code generator. They shouldn't be used directly.
+
+struct POLICY_EXPORT SchemaNode {
+  base::Value::Type type;
+
+  // If |type| is TYPE_LIST then this is a SchemaNode* describing the
+  // element type.
+  //
+  // If |type| is TYPE_DICTIONARY then this is a PropertiesNode* that can
+  // contain any number of named properties and optionally a SchemaNode* for
+  // additional properties.
+  //
+  // This is NULL if |type| has any other values.
+  const void* extra;
+};
+
+struct POLICY_EXPORT PropertyNode {
+  const char* key;
+  const SchemaNode* schema;
+};
+
+struct POLICY_EXPORT PropertiesNode {
+  const PropertyNode* begin;
+  const PropertyNode* end;
+  const SchemaNode* additional;
+};
+
+}  // namespace internal
+}  // namespace policy
+
+#endif  // COMPONENTS_POLICY_CORE_COMMON_SCHEMA_INTERNAL_H_