Checking in retrolambda into third_party/

Retrolambda will be used to transform Java 8's bytecode to Java 7's
bytecode so that Java 8 features such as lamba expressions can be used
on Chrome for Android without switching from javac to Jack.

BUG=642600

Review-Url: https://codereview.chromium.org/2559553002
Cr-Commit-Position: refs/heads/master@{#436968}
6 files changed