[twopass temporal svc] Fix decoding error on seek.
Don't put small empty frame in front of a key frame. We will put key frame flag in webm container if there's a visible key frame. But there will be decoding error when we seek to here if we put the small empty frame, which will be inter frame, in front of it. Change-Id: Id50c2c1fd31da0405ff6faa7375cc2f49c55402d
Showing with 5 additions and 1 deletion