Trying to end a three-game skid, the Raiders flew to Qualcomm Stadium for an AFC West rematch with the San Diego Chargers.  After a scoreless first quarter, RB ReShard Lee helped the Raiders strike first with a 1-yard TD run.  The Chargers would respond with RB LaDainian Tomlinson with a 4-yard TD run.  In the third quarter, Oakland got the lead with QB Aaron Brooks completing a 2-yard TD pass to rookie WR John Madsen for the only score of the period.  However, in the fourth quarter, San Diego took control for the win, as Tomlinson threw a successful 19-yard TD pass to TE Antonio Gates on an HB Option.  Afterwards, Tomlinson would end the game with a 10-yard TD run.  With the loss, the Raiders fell to 2-9.
Question: How many total yards of touchdown passes were thrown in the game?
Answer: 21