tree 3fd16900f63d7f8fc4fc5e7538a591de19e410c1
parent f00cb8c6bf49f59b22fe40a9519b4e3f7ef2b2a7
author Pengquan Meng <mpq@google.com> 1511315562 -0800
committer Pengquan Meng <mpq@google.com> 1513653871 -0800

Add connection service focus manager

This changed introduce the ConnectionServiceFocusManager to maintain the
focus status of ConnectionService. When a ConnectionService gained the
focus, it can request the call resource. Also, the ConnectionService
should release the call resource when it lost the focus.

design doc: go/android-telecom-3p-enhancements

Bug: 69651192
Test: unit test

Change-Id: Iea7b4bfd896753ea9d6f399ba341e36150e4e621