Expose signing key from cloud policy stores

chrome/browser/chromeos/policy/device_cloud_policy_store_chromeos.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/chromeos/policy/device_cloud_policy_store_chromeos.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 180 matching lines @@
       if (policy_data)
         policy_->MergeFrom(*policy_data);
 
       PolicyMap new_policy_map;
       if (is_managed()) {
         DecodeDevicePolicy(*device_settings_service_->device_settings(),
                            &new_policy_map);
       }
       policy_map_.Swap(&new_policy_map);
 
+      scoped_refptr<ownership::PublicKey> key =
+          device_settings_service_->GetPublicKey();
+      public_key_ = key ? key->as_string() : std::string();

[Thiemo Nagel, 2016/11/16 16:50:06]

public_key_ doesn't seem to exist yet?

[emaxx, 2016/11/16 22:05:58]

Nope, it's defined in the base class CloudPolicyStore.
The idea is the same as for the existing CloudPolicyStore::policy_,
CloudPolicyStore::status_, etc.: the base class defines members and public
accessors, while subclasses implement filling these members with the actual
values.

[Thiemo Nagel, 2016/11/17 17:19:56]

Sorry, I've overlooked that.

+
       NotifyStoreLoaded();
       return;
     }
     case chromeos::DeviceSettingsService::STORE_KEY_UNAVAILABLE:
       status_ = STATUS_BAD_STATE;
       break;
     case chromeos::DeviceSettingsService::STORE_POLICY_ERROR:
     case chromeos::DeviceSettingsService::STORE_OPERATION_FAILED:
       status_ = STATUS_STORE_ERROR;
       break;
     case chromeos::DeviceSettingsService::STORE_NO_POLICY:
     case chromeos::DeviceSettingsService::STORE_INVALID_POLICY:
     case chromeos::DeviceSettingsService::STORE_VALIDATION_ERROR:
     case chromeos::DeviceSettingsService::STORE_TEMP_VALIDATION_ERROR:
       status_ = STATUS_LOAD_ERROR;
       break;
   }
 
   NotifyStoreError();
 }
 
 }  // namespace policy