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
(cherry picked from https://android-review.googlesource.com/q/commit:a0f6b3c00bda4231c054624f36dd6e5c50102c9c)
Merged-In: I610d2ebbbd42bc3004504d2aef4c5c408e635fe5
Change-Id: I610d2ebbbd42bc3004504d2aef4c5c408e635fe5
12 files changed