Set the generation on peer reflexive candidates when created.

If an actual peer reflexive candidate was created (and not one that
would just be replaced by a different candidate later), we weren't
setting the generation value. This means that new-generation prflx
candidate pairs weren't being prioritized above the cross-generation
pairs, or above relay<->relay pairs.

R=honghaiz@webrtc.org, pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/2086793002 .

Cr-Original-Commit-Position: refs/heads/master@{#13259}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: f7c15a915924d5a2c2afb7eeaed828728da1f9ec
3 files changed