Merge "Add adhoc conference APIs to RemoteConnection and RemoteConnectionService." am: 329c6ff777 am: e40cfa60de am: 6a55cd1644 am: 300b3cce72

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1388908

Change-Id: I26980870eb16299663f7553314d1f68ee90067f0