Add device policies to control accessibility settings on the login screen

chrome/browser/chromeos/policy/login_profile_policy_provider.h

+// Copyright (c) 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 CHROME_BROWSER_CHROMEOS_POLICY_LOGIN_PROFILE_POLICY_PROVIDER_H_
+#define CHROME_BROWSER_CHROMEOS_POLICY_LOGIN_PROFILE_POLICY_PROVIDER_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/policy/configuration_policy_provider.h"
+#include "chrome/browser/policy/policy_service.h"
+
+namespace policy {
+
+// Policy provider for the login profile. Since the login profile is not
+// associated with any user, it does not receive regular user policy. However,
+// several device policies that control features on the login screen surface as
+// recommended user policies in the login profile.
+class LoginProfilePolicyProvider : public ConfigurationPolicyProvider,
+                                   public PolicyService::Observer {
+ public:
+  explicit LoginProfilePolicyProvider(PolicyService* device_policy_service);
+  virtual ~LoginProfilePolicyProvider();
+
+  // ConfigurationPolicyProvider:
+  virtual void Init() OVERRIDE;
+  virtual void Shutdown() OVERRIDE;
+  virtual bool IsInitializationComplete(PolicyDomain domain) const OVERRIDE;
+  virtual void RefreshPolicies() OVERRIDE;
+
+  // PolicyService::Observer:
+  virtual void OnPolicyUpdated(const PolicyNamespace& ns,
+                               const PolicyMap& previous,
+                               const PolicyMap& current) OVERRIDE;
+  virtual void OnPolicyServiceInitialized(PolicyDomain domain) OVERRIDE;
+
+ private:
+  void UpdateFromDevicePolicy();
+
+  PolicyService* device_policy_service_;  // Not owned.
+
+  base::WeakPtrFactory<LoginProfilePolicyProvider> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(LoginProfilePolicyProvider);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_CHROMEOS_POLICY_LOGIN_PROFILE_POLICY_PROVIDER_H_