[automerger skipped] add java_api_finder plugin to mainline module DocumentsUI...

[automerger skipped] add java_api_finder plugin to mainline module DocumentsUI to generate java APIs used by DocumentsUI. am: 5d29a018 am: e010a371 am: 820e2d14
am: 582545c6 -s ours
am skip reason: change_id I44f2e6657a0e036267ec6563891a2aa95f4cf0f9 with SHA1 9afb4f9a is in history

Change-Id: I50612b114e0fd0ab86b06851d7f749e0e2dcf1a4