Call Call::GetStats() from the correct thread in VideoSendStreamTest.
Call Call::GetStats() from the correct thread in VideoSendStreamTest.

Bug: webrtc:10847
Change-Id: Ia471e132f35385d702f5d279a023ac7aa554069b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/148060
Reviewed-by: Magnus Flodman <3824e10219998be3d28f43c1b42bf2b769d2c38c@webrtc.org>
Commit-Queue: Tommi <74a97831ec830b6e3846c6faa50560947ae01c68@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#28800}

TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc