Surface error messages from ONC parsing in about:policy.

chrome/browser/policy/configuration_policy_handler_chromeos.h

+// 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 CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_HANDLER_CHROMEOS_H_
+#define CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_HANDLER_CHROMEOS_H_
+#pragma once
+
+#include "chrome/browser/policy/configuration_policy_handler.h"
+
+namespace policy {
+
+// ConfigurationPolicyHandler for validation of the network configuration
+// policies. These actually don't set any preferences, but the handler just
+// generates error messages.
+class NetworkConfigurationPolicyHandler : public TypeCheckingPolicyHandler {
+ public:
+  explicit NetworkConfigurationPolicyHandler(ConfigurationPolicyType type);
+  virtual ~NetworkConfigurationPolicyHandler();
+
+  // ConfigurationPolicyHandler methods:
+  virtual bool CheckPolicySettings(const PolicyMap& policies,
+                                   PolicyErrorMap* errors) OVERRIDE;
+  virtual void ApplyPolicySettings(const PolicyMap& policies,
+                                   PrefValueMap* prefs) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NetworkConfigurationPolicyHandler);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_HANDLER_CHROMEOS_H_