TIF: Add pixel aspect ratio to TvTrackInfo

Needed to handle scaling properly for some video formats such as 720x576
4:3 and 720x576 16:9 (the most common European SD formats) where pixels
are not square.

Bug: 19500694
Change-Id: I4d245ed40e8b80f7efd6acdb059d20b63b4ef9de
3 files changed