Sebastian Jansson 2d87a50b46 Only process cross traffic simulation if added.
This avoids extra processing overhead when there's no cross traffic
simulation active.

Bug: webrtc:10365
Change-Id: I8c8ae2fb823a47af2406e62ae350ebb551169646
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/133620
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27705}
2019-04-23 10:04:07 +00:00
..
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