Add ManagedModePolicyProvider and extension API to get and set policies.

chrome/browser/policy/managed_mode_policy_provider.h

Index: chrome/browser/policy/managed_mode_policy_provider.h
diff --git a/chrome/browser/policy/managed_mode_policy_provider.h b/chrome/browser/policy/managed_mode_policy_provider.h
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+// Copyright (c) 2012 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_MANAGED_MODE_POLICY_PROVIDER_H_
+#define CHROME_BROWSER_POLICY_MANAGED_MODE_POLICY_PROVIDER_H_
+#pragma once
+
+#include "base/memory/ref_counted.h"
+#include "chrome/browser/policy/configuration_policy_provider.h"
+#include "chrome/browser/profiles/profile_keyed_service.h"
+#include "chrome/common/persistent_pref_store.h"
+
+class Profile;
+
+namespace policy {
+
+// This class sets policies that are defined by a local user via "Managed Mode".
+// It offers methods to set and read policies, and persists them on disk in
+// JSON format.
+class ManagedModePolicyProvider
+    : public ProfileKeyedService,
+      public ConfigurationPolicyProvider,
+      public PrefStore::Observer {
+ public:
+  // The dictionary key under which we store the policy dictionary. Public for
+  // testing.
+  static const char kPolicies[];
+
+  // Creates a new ManagedModePolicyProvider that caches its policies in a JSON
+  // file inside the profile folder.
+  static ManagedModePolicyProvider* Create(Profile* profile);
+
+  // Use this constructor to inject a different PrefStore (e.g. for testing).
+  explicit ManagedModePolicyProvider(PersistentPrefStore* store);
+  virtual ~ManagedModePolicyProvider();
+
+  // Returns the stored value for a policy with the given |key|, or NULL if no
+  // such policy is defined.
+  const base::Value* GetPolicy(const std::string& key) const;
+  // Sets the policy with the given |key| to a copy of the given |value|.
+  void SetPolicy(const std::string& key, const base::Value* value);
+
+  // ConfigurationPolicyProvider implementation:
+  virtual void RefreshPolicies() OVERRIDE;
+  virtual bool IsInitializationComplete() const OVERRIDE;
+
+  // PrefStore::Observer implementation:
+  virtual void OnPrefValueChanged(const std::string& key) OVERRIDE;
+  virtual void OnInitializationCompleted(bool success) OVERRIDE;
+
+ private:
+  base::DictionaryValue* GetCachedPolicy() const;
+  void UpdatePolicyFromCache();
+
+  // Used for persisting policies. Unlike other PrefStores, this one is not
+  // hooked up to the PrefService.
+  scoped_refptr<PersistentPrefStore> store_;
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_POLICY_MANAGED_MODE_POLICY_PROVIDER_H_