Fix project settings. [DO NOT MERGE]

1. Update layoutlib_api source path.
2. Update jdk version
3. Update nullity annotations.

Change-Id: I48db7dbd7ba5ff02fcf11672608b75e072385166
(cherry picked from commit 7b2cae5072321da5d67f9d12dea10871326f3477)
2 files changed