The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2645d975565b8d118d68131126237ab879217f84

commit 2645d975565b8d118d68131126237ab879217f84
Author: Avi Drissman <avi@chromium.org>
Date: Fri Apr 13 20:01:41 2018

Disable a failing test.

BUG= 832842 
TBR=hbos@chromium.org
NOTRY=true

Change-Id: I5329fc3c5b0c1e1d330471ceab8edf66ce24dbad
Reviewed-on: https://chromium-review.googlesource.com/1012454
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550735}
[modify] https://crrev.com/2645d975565b8d118d68131126237ab879217f84/third_party/WebKit/LayoutTests/TestExpectations

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2645d975565b8d118d68131126237ab879217f84

commit 2645d975565b8d118d68131126237ab879217f84
Author: Avi Drissman <avi@chromium.org>
Date: Fri Apr 13 20:01:41 2018

Disable a failing test.

BUG= 832842 
TBR=hbos@chromium.org
NOTRY=true

Change-Id: I5329fc3c5b0c1e1d330471ceab8edf66ce24dbad
Reviewed-on: https://chromium-review.googlesource.com/1012454
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550735}
[modify] https://crrev.com/2645d975565b8d118d68131126237ab879217f84/third_party/WebKit/LayoutTests/TestExpectations

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/828096ff88cd17a2d3681940f3550fa105d22943

commit 828096ff88cd17a2d3681940f3550fa105d22943
Author: Kunihiko Sakamoto <ksakamoto@chromium.org>
Date: Mon Aug 06 02:19:01 2018

Mark virtual/webrtc-wpt-unified-plan/external/wpt/webrtc/RTCDTMFSender-ontonechange.https.html as Failure on Linux

Failing on Linux (dbg) too.

TBR=hbos@chromium.org

No-Try: true
Bug:  832842 
Change-Id: I6eaa6c2814046a5452ab0a2d63524b6650f6803b
Reviewed-on: https://chromium-review.googlesource.com/1163236
Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580791}
[modify] https://crrev.com/828096ff88cd17a2d3681940f3550fa105d22943/third_party/WebKit/LayoutTests/TestExpectations

Can I reassign to you hta? ontone change sounds like your turf.

this is also flaky on Mac. See  issue 872632  for details.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/526dc8867e1521d3e7ec424221f2aff112fceb01

commit 526dc8867e1521d3e7ec424221f2aff112fceb01
Author: vitaliii <vitaliii@chromium.org>
Date: Thu Aug 09 09:20:30 2018

Disable flaky v/w/e/w/w/RTCDTMFSender-ontonechange.https.html (Mac).

virtual/webrtc-wpt-unified-plan/external/wpt/webrtc/RTCDTMFSender-ontonechange.https.html

TBR=hta@chromium.org
NOTRY=true

Bug:  832842 , 872632 
Change-Id: If9522e93d1851b762c67005aa8fdcd83a71631fd
Reviewed-on: https://chromium-review.googlesource.com/1169016
Reviewed-by: vitaliii <vitaliii@chromium.org>
Commit-Queue: vitaliii <vitaliii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581839}
[modify] https://crrev.com/526dc8867e1521d3e7ec424221f2aff112fceb01/third_party/WebKit/LayoutTests/TestExpectations

Please have a look.

Seems this is flaky for non-unified too, so merging to the non-unified bug.

Pri 2 seems more suitable, since this is a very rarely used API.