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Pre-support for ApiSerializable interface

Description

Pre-support for ApiSerializable interface

This adds the methods required by the ApiSerializable interface, but does
not directly implement the class so this can be merged before the dependent
core patch is merged. That is required because the core patch is currently
failing tests due to this. That patch is I7b37295e88

Bug: T90745
Change-Id: I2ab697be8e3cab312fe9642de804dc199a8c76f8