Flakiness dashboard link:
https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=capture_unittests&tests=ReceiveFramesFromSinglePlaneFakeDevice

Looking at some more history, it appears to have been flaky all along: https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=capture_unittests&showAllRuns=true&tests=ReceiveFramesFromSinglePlaneFakeDevice

CL with fix is up for review: https://chromium-review.googlesource.com/c/chromium/src/+/1225973

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/760fb09cb4cb2650c4d3774070cd171a8095738d

commit 760fb09cb4cb2650c4d3774070cd171a8095738d
Author: Christian Fremerey <chfremer@chromium.org>
Date: Thu Sep 13 22:51:42 2018

[Video Capture, Linux] Fix flaky test ReceiveFramesFromSinglePlaneFakeDevice

This fixes a deadlock issue in test-only code fake_v4l2_impl.cc.

Bug:  883941 
Change-Id: Ie6de0e026d79cd3559852e255e464e1abbf4a564
Reviewed-on: https://chromium-review.googlesource.com/1225973
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Commit-Queue: Christian Fremerey <chfremer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591189}
[modify] https://crrev.com/760fb09cb4cb2650c4d3774070cd171a8095738d/media/capture/video/linux/fake_v4l2_impl.cc