[automerger skipped] add java_api_finder plugin to mainline module DocumentsUI to generate java APIs used by DocumentsUI. am: 5d29a018d1 am: e010a371e1
am: ace565edaa -s ours
am skip reason: change_id I44f2e6657a0e036267ec6563891a2aa95f4cf0f9 with SHA1 5d29a018d1 is in history

Change-Id: I1fff991a3c355e9ff9cc5f4c6a4e2bb301a7180b