Add additional overriding methods to signature files

This change adds overriding methods that are essential to compile the
stubs generated from the signature files.

More information and the background for this change is available at
go/add-overriding-one-pager.

Test: m checkbuild --build-from-text-stub
Bug: 299366704
Change-Id: Ia8f0ae4b4e47a2974016fd844242aa0564027131
Merged-In: Ifc1876eb60a4b716f72c86003dc9bea0081e9a4c