Allow policy refresh rate to be configured through policy.

chrome/browser/policy/profile_policy_context.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_POLICY_PROFILE_POLICY_CONTEXT_H_
 #define CHROME_BROWSER_POLICY_PROFILE_POLICY_CONTEXT_H_
 #pragma once
 
 #include "base/scoped_ptr.h"
+#include "chrome/browser/prefs/pref_member.h"
+#include "chrome/common/notification_observer.h"
 
 class Profile;
 
 namespace policy {
 
 class DeviceManagementPolicyProvider;
 class DeviceManagementService;
 
 // This class is a container for the profile-specific policy bits located in the
 // profile. Since the context owns the policy provider, it's vital that it gets
 // initialized before the profile's prefs and destroyed after the prefs are
 // gone.
-class ProfilePolicyContext {
+class ProfilePolicyContext : public NotificationObserver {
  public:
   explicit ProfilePolicyContext(Profile* profile);
   ~ProfilePolicyContext();
 
   // Initializes the context. Should be called only after the profile's request
   // context is up.
   void Initialize();
 
   // Shuts the context down. This must be called before the networking
   // infrastructure in the profile goes away.
   void Shutdown();
 
   // Get the policy provider.
   DeviceManagementPolicyProvider* GetDeviceManagementPolicyProvider();
 
+  // Register preferences.
+  static void RegisterUserPrefs(PrefService* user_prefs);
+
+  static const int kDefaultPolicyRefreshRateInMilliseconds =
+      3 * 60 * 60 * 1000; // 3 hours.
+
  private:
+  // Updates the policy provider with a new refresh rate value.
+  void UpdatePolicyRefreshRate();
+
+  // NotificationObserver overrides.
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
   // The profile this context is associated with.
   Profile* profile_;
 
+  // Tracks the pref value for the policy refresh rate.
+  IntegerPrefMember policy_refresh_rate_;
+
   // The device management service.
   scoped_ptr<DeviceManagementService> device_management_service_;
 
   // Our provider.
   scoped_ptr<DeviceManagementPolicyProvider> device_management_policy_provider_;
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_PROFILE_POLICY_CONTEXT_H_