This is used to output a mapping of class member signature to source
position, which in turn is used for automated addition of annotations in
frameworks code.
Metalava support does not exist (yet), and may not be needed, since the
addition of these annotations in a one-time thing. This change can be
reverted once this is complete.
See go/hidden-api-annotations for more context.
Test: m
Bug: 110868826
Change-Id: I90e409f6ea02b16eb9e03d92382f9bb46a8fdab5
76c3de1cea