Move user cloud policy to BrowserProcess (was 6979011)

chrome/browser/policy/cloud_policy_provider.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_POLICY_CLOUD_POLICY_PROVIDER_H_
+#define CHROME_BROWSER_POLICY_CLOUD_POLICY_PROVIDER_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "chrome/browser/policy/cloud_policy_cache_base.h"
+#include "chrome/browser/policy/configuration_policy_provider.h"
+
+namespace policy {
+
+// A policy provider having multiple backend caches, combining their relevant
+// PolicyMaps and keeping the result cached. The underlying caches are kept as
+// weak references and can be added  dynamically. Also the
+// |CloudPolicyProvider| instance listens to cache-notifications and removes
+// the caches automatically when they go away. The order in which the caches are
+// stored matters! The first cache is applied as is and the following caches
+// only contribute the not-yet applied policies. There are two functions to add
+// a new cache:
+//   PrependCache(cache): adds |cache| to the front (i.e. most important cache).
+//   AppendCache(cache):  adds |cache| to the back (i.e. least important cache).
+class CloudPolicyProvider : public ConfigurationPolicyProvider {
+ public:
+  explicit CloudPolicyProvider(
+      const ConfigurationPolicyProvider::PolicyDefinitionList* policy_list);
+  virtual ~CloudPolicyProvider();
+
+  // Adds a new instance of CloudPolicyCacheBase to the end of |caches_|.
+  // Does not take ownership of |cache| and listens to OnCacheGoingAway to
+  // automatically remove it from |caches_|.
+  virtual void AppendCache(CloudPolicyCacheBase* cache) = 0;
+
+  // Adds a new instance of CloudPolicyCacheBase to the beginning of |caches_|.
+  // Does not take ownership of |cache| and listens to OnCacheGoingAway to
+  // automatically remove it from |caches_|.
+  virtual void PrependCache(CloudPolicyCacheBase* cache) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CloudPolicyProvider);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_POLICY_CLOUD_POLICY_PROVIDER_H_