Since I'm adding several new samples at once, I've added them alphabetically. (Ordinarily the newest samples go at the top.) Per our discussion, removed all the samples that used to be on the "What's New" page. See first comment for doc stage location. bug: 21406143 Change-Id: Ib637ba3cf425a6b96cd97d08d5d9eefb8eac1a5d