base

Correctly save Activity's state in saveInstanceState

Prior to this change, saveInstanceState would
call directly to Activity.onSaveInstanceState(),
rather than performSaveInstanceState().
This meant that saveManagdDialogs() was not called,
so Activities running under a LocalActivityManager
do not get their dialogs restored on configuration changes.

Change-Id: Id45110a8716a86958c14f4b1ea5a84c9cdf107f1