Expose signing key from cloud policy stores

chrome/browser/chromeos/policy/device_cloud_policy_store_chromeos.cc

Index: chrome/browser/chromeos/policy/device_cloud_policy_store_chromeos.cc
diff --git a/chrome/browser/chromeos/policy/device_cloud_policy_store_chromeos.cc b/chrome/browser/chromeos/policy/device_cloud_policy_store_chromeos.cc
index b3bfde5f21bf78f3fa2c780e86239b174fc0ab6d..c1b53fd5f7bdf4d7cc178c0ef27e1a526dc84cad 100644
--- a/chrome/browser/chromeos/policy/device_cloud_policy_store_chromeos.cc
+++ b/chrome/browser/chromeos/policy/device_cloud_policy_store_chromeos.cc
@@ -198,6 +198,10 @@ void DeviceCloudPolicyStoreChromeOS::UpdateFromService() {
       }
       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;
     }