Parameterize scopes with additional droidstubs args

Added droidstubsArgs field to the apiscope structure to avoid
switching on api scope type.

Bug: 153443117
Bug: 153306490
Test: m nothing
Merged-In: I96f0eb033d44c6a74787ba7f1523799b05a58092
Change-Id: I96f0eb033d44c6a74787ba7f1523799b05a58092