Adapt to Jack compilation specifics. Fix bad import in VideoDumpActivity. The extra semicolumn is ignored by javac because of https://bugs.openjdk.java.net/browse/JDK-8027682 but is not permitted by ecj or Jack. This includes cherry-picks of the following changes:248ef6f9c4705555dc46f50a51fb4cbf5ad8d994Change-Id: Ifbe063e3822a7d63b1681921b9788cfca898ba64