Abandon user sign in when policy is retrieved before session started

chromeos/dbus/blocking_method_caller.h

Index: chromeos/dbus/blocking_method_caller.h
diff --git a/chromeos/dbus/blocking_method_caller.h b/chromeos/dbus/blocking_method_caller.h
index c70c6748940238cceab1d200afe9c31d59adc1e8..6dad566d9ccc59c8eb6fe2c6f4d215c7563438b3 100644
--- a/chromeos/dbus/blocking_method_caller.h
+++ b/chromeos/dbus/blocking_method_caller.h
@@ -14,6 +14,7 @@ namespace dbus {
 
 class Bus;
 class ObjectProxy;
+class ScopedDBusError;
 
 }  // namespace dbus
 
@@ -31,6 +32,12 @@ class CHROMEOS_EXPORT BlockingMethodCaller {
   std::unique_ptr<dbus::Response> CallMethodAndBlock(
       dbus::MethodCall* method_call);
 
+  // Calls the method and blocks until it returns. Populates the |error| and
+  // returns null in case of an error.
+  std::unique_ptr<dbus::Response> CallMethodAndBlockWithError(
+      dbus::MethodCall* method_call,
+      dbus::ScopedDBusError* error_out);
+
  private:
   dbus::Bus* bus_;
   dbus::ObjectProxy* proxy_;