Update bundle behavior to match BundlePolicy spec in http://rtcweb-wg.github.io/jsep/.

BUG=1574
R=juberti@webrtc.org, pthatcher@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/36659004

Cr-Original-Commit-Position: refs/heads/master@{#8851}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 0e209b03bf55d6daf209e35b3a8e8b6eab3d4d52
2 files changed