Reland of Use TaskQueue in IncomingVideoStream (patchset #1 id:1 of https://codereview.webrtc.org/2714393003/ )

Use TaskQueue in IncomingVideoStream instead of the PlatformThread + event timer approach.

TBR=mflodman@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7219, webrtc:7253

Reland of
https://chromium.googlesource.com/external/webrtc/+/686aa37382428bc667adff8cd6895674cae4e5fd (revert)
https://chromium.googlesource.com/external/webrtc/+/e2d1d6429557af4560a97581a5e282b54c742173 (original)

Review-Url: https://codereview.webrtc.org/2720773002
Cr-Original-Commit-Position: refs/heads/master@{#16872}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: ede0759c041715646f70ce4eb1fc85d69c963d18
5 files changed