Preference provider implementation backed by JSON files in a directory.

chrome/browser/configuration_policy_provider.h

 // 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 CHROME_BROWSER_CONFIGURATION_POLICY_PROVIDER_H_
 #define CHROME_BROWSER_CONFIGURATION_POLICY_PROVIDER_H_
 
+#include "base/basictypes.h"
+
 class ConfigurationPolicyStore;
+class DictionaryValue;
 
 // An abstract super class for platform-specific policy providers.
 // Platform-specific policy providers (Windows Group Policy, gconf,
 // etc.) should implement a subclass of this class.
 class ConfigurationPolicyProvider {
  public:
-  ConfigurationPolicyProvider();
+  ConfigurationPolicyProvider() {}
   virtual ~ConfigurationPolicyProvider() {}
 
   // Must be implemented by provider subclasses to specify the
   // provider-specific policy decisions. The preference service
   // invokes this |Provide| method when it needs a policy
   // provider to specify its policy choices. In |Provide|,
-  // the |ConfigurationPolicyProvider| must make calls to the
+  // the ConfigurationPolicyProvider must make calls to the
   // |Apply| method of |store| to apply specific policies.
   // Returns true if the policy could be provided, otherwise false.
   virtual bool Provide(ConfigurationPolicyStore* store) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ConfigurationPolicyProvider);
 };
 
+// Base functionality for all policy providers that use a DictionaryValue tree
+// structure holding key-value pairs for storing policy settings. Decodes the
+// value tree and writes the configuration to the given |store|.
+void DecodePolicyValueTree(DictionaryValue* policies,
+                           ConfigurationPolicyStore* store);
+
 #endif  // CHROME_BROWSER_CONFIGURATION_POLICY_PROVIDER_H_
-