Implement fetching, caching and retrieval of external policy data

chrome/browser/policy/cloud/user_cloud_policy_store_base.cc

 // 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.
 
 #include "chrome/browser/policy/cloud/user_cloud_policy_store_base.h"
 
+#include "chrome/browser/policy/cloud/cloud_external_data_manager.h"
 #include "chrome/browser/policy/cloud/cloud_policy_constants.h"
+#include "chrome/browser/policy/policy_map.h"
 #include "policy/proto/cloud_policy.pb.h"
 
 namespace policy {
 
 // Decodes a CloudPolicySettings object into a policy map. The implementation is
 // generated code in policy/cloud_policy_generated.cc.
 void DecodePolicy(const enterprise_management::CloudPolicySettings& policy,
+                  base::WeakPtr<CloudExternalDataManager> external_data_manager,
                   PolicyMap* policies);
 
 UserCloudPolicyStoreBase::UserCloudPolicyStoreBase() {
 }
 
 UserCloudPolicyStoreBase::~UserCloudPolicyStoreBase() {
 }
 
 scoped_ptr<UserCloudPolicyValidator> UserCloudPolicyStoreBase::CreateValidator(
     scoped_ptr<enterprise_management::PolicyFetchResponse> policy) {
   // Configure the validator.
   UserCloudPolicyValidator* validator =
       UserCloudPolicyValidator::Create(policy.Pass());
   validator->ValidatePolicyType(dm_protocol::kChromeUserPolicyType);
   validator->ValidateAgainstCurrentPolicy(
       policy_.get(),
       CloudPolicyValidatorBase::TIMESTAMP_REQUIRED,
       CloudPolicyValidatorBase::DM_TOKEN_REQUIRED);
   validator->ValidatePayload();
   return scoped_ptr<UserCloudPolicyValidator>(validator);
 }
 
 void UserCloudPolicyStoreBase::InstallPolicy(
     scoped_ptr<enterprise_management::PolicyData> policy_data,
     scoped_ptr<enterprise_management::CloudPolicySettings> payload) {
   // Decode the payload.
   policy_map_.Clear();
-  DecodePolicy(*payload, &policy_map_);
+  DecodePolicy(*payload, external_data_manager(), &policy_map_);
   policy_ = policy_data.Pass();
 }
 
 }  // namespace policy