Add mojo_lexer.py to the whitelist of licenses for Android.

TBR=torne@chromium.org

Review URL: https://codereview.chromium.org/134483004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244264 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244264