Added support for signed policy blobs on desktop.

chrome/browser/chromeos/settings/device_settings_service.h

Index: chrome/browser/chromeos/settings/device_settings_service.h
diff --git a/chrome/browser/chromeos/settings/device_settings_service.h b/chrome/browser/chromeos/settings/device_settings_service.h
index b70a7537454dabe82b9b08837e348cf582923a98..16c5d8fa63e8cac4d89403fa6996e6c64655d979 100644
--- a/chrome/browser/chromeos/settings/device_settings_service.h
+++ b/chrome/browser/chromeos/settings/device_settings_service.h
@@ -15,6 +15,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
+#include "base/stl_util.h"
 #include "chromeos/dbus/session_manager_client.h"
 #include "chromeos/tpm_token_loader.h"
 #include "components/policy/core/common/cloud/cloud_policy_validator.h"
@@ -46,6 +47,12 @@ class OwnerKey : public base::RefCountedThreadSafe<OwnerKey> {
   const std::vector<uint8>* public_key() {
     return public_key_.get();
   }
+
+  std::string public_key_as_string() {
+    return std::string(reinterpret_cast<const char*>(
+        vector_as_array(public_key_.get())), public_key_->size());
+  }
+
   crypto::RSAPrivateKey* private_key() {
     return private_key_.get();
   }