Add logging to help debug loader issue.

Sometimes, it looks like the loader is not returning the result
to populate the storage settings view. The current bug reports
have no smoking guns. By adding this debug logging to the build,
the bug reports should hopefully help lead us to where the bug
is originating.

Bug: 35389719
Test: None
Change-Id: Ifa3f69f1fb4669aa72e6ef9c7ccc9d74b9e0fa71