Currently, Java equivalent of webrtc::field_trial::FindFullName is in
PeeerConnectionFactory, which belongs to peerconnection_java GN target.
Move that method into a separate file and GN target to make it easier
to use the fieldTrialsFindFullName method in other code.
Bug: webrtc:13973
Change-Id: I4d7d30339883af76c1d066f72270c6caf9c64c49
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/261500
Reviewed-by: Xavier Lepaul <xalep@webrtc.org>
Commit-Queue: Xavier Lepaul <xalep@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37233}
d609473b9c