tree a04f3be883f72c9bb2f39973d636c2d9505ee842
parent ce0a793da137213541d68bdef9e75c7c081e0593
author Kyunglyul Hyun <klhyun@google.com> 1577695564 +0900
committer Kyunglyul Hyun <klhyun@google.com> 1577769996 +0900

MediaRouter: make request id globally unique

A unique request id can be used to identify each request
and the client of the request.

Test: atest mediaroutertest
Change-Id: I3234eaf0c4d398a47d412bc13ce711165d87e2db