shill: ProfileDBusPropertyExporter: Export Cert IDs

Export Cert ID and Key ID properties so that Chrome can identify
stored (non-visible) profile entries which need their certificates
to be updated.

BUG=chromium-os:37167
TEST=Added unit tests.

Change-Id: I28df7c907a114187f53956639f06b98533f53965
Reviewed-on: https://gerrit.chromium.org/gerrit/39659
Commit-Ready: Paul Stewart <pstew@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Tested-by: Paul Stewart <pstew@chromium.org>
diff --git a/profile_dbus_property_exporter.h b/profile_dbus_property_exporter.h
index 1e41403..4956924 100644
--- a/profile_dbus_property_exporter.h
+++ b/profile_dbus_property_exporter.h
@@ -36,6 +36,8 @@
                              Error *error);
 
  private:
+  bool LoadEapServiceProperties(PropertyList *properties,
+                                Error *error);
   bool LoadWiFiServiceProperties(PropertyList *properties,
                                  Error *error);