sysui: refactor for extension.

Make addTile in QSPanel return a TileRecord.

Bug: 28532600
Change-Id: I007d2f9caba410a8c9108e773822a467745b951c
(cherry picked from commit 63a18b4082f0ad9f8696f6a8a370a9df6210eebc)
1 file changed