Signed settings refactoring: Proper caching and more tests.

chrome/browser/chromeos/login/signed_settings_cache.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_CHROMEOS_LOGIN_SIGNED_SETTINGS_CACHE_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_SIGNED_SETTINGS_CACHE_H_
+#pragma once
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/values.h"
+#include "chrome/browser/policy/proto/chrome_device_policy.pb.h"
+#include "chrome/browser/policy/proto/device_management_backend.pb.h"
+
+namespace em = enterprise_management;
+
+class PrefService;
+
+namespace chromeos {
+
+// There is need (metrics at OOBE stage) to store settings
+// (that normally would go into SignedSettings storage)
+// before owner has been assigned (hence no key is available).
+// This set of functions serves as a transient storage in that case.
+namespace signed_settings_cache {
+// Registers required pref section.
+void RegisterPrefs(PrefService* local_state);
+
+// Stores a new policy blob inside the cache stored in |local_state|.
+bool Store(const em::PolicyData &policy, PrefService* local_state);
+
+// Retrieves the policy blob from the cache stored in |local_state|.
+bool Retrieve(em::PolicyData *policy, PrefService* local_state);
+
+// Call this after owner has been assigned to persist settings
+// into SignedSettings storage.
+void Finalize(PrefService* local_state);
+}  // namespace signed_settings_cache
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SIGNED_SETTINGS_CACHE_H_