?attr/foo in platform files wasn't resolved properly. The IDE checked
the app namespace for the attribute even though it is being referenced
from a platform file.
Change-Id: I7db6dfef5b540d99804c298120578da9d060b886
(cherry picked from commit 8974a5e6d8408b4cd93f1befb05cc9b654b71e4a)
a0fc1f4626