Add inherited fields from hidden base to the stub classes

Previously if a class implements a hidden interface,
the public fields of the interface appear in the generated docs
(see ClassInfo.makeHDF()), but not in the generated stubs
(thereby not in the SDK's android.jar and the api.txt).
This change fixed the discrepancy.

Bug: 13721174
Change-Id: I2f4d29cec935b81c13414298a4e8f9671d6c8c3f
1 file changed