f33cee7534
Make RtcEventLogImpl to use a TaskQueue instead of a helper-thread. This will eventually allow us to run multiple log sessions on a single task-queue. BUG=webrtc:8142, webrtc:8143, webrtc:8145 Review-Url: https://codereview.webrtc.org/3007473002 Cr-Commit-Position: refs/heads/master@{#19666}