Stubs required for javac to compile lambda code

In order for javac to compile code with (non-serializable) lambdas
the included classes are required. These are based on OpenJDK 8
source code which has then been stubbed. The stubs are only
required for build paths that use javac (e.g. javadoc) and
are not to be deployed to a device.

Bug: 26753820
(cherry-picked from commit 35eb86d88d048c5010ca406a8d543a54b84ca7b8)

Change-Id: I1de207b54865ded4c0582dd2f3c3f8f9bebda11f
9 files changed