For future reference, the watch time metric is implemented in  issue 633743 .

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3d927e7a3cf8aec8832391396ae8c99750229345

commit 3d927e7a3cf8aec8832391396ae8c99750229345
Author: sandersd <sandersd@chromium.org>
Date: Thu Sep 01 00:14:43 2016

WMPI: Add base::Feature for disabling SurfaceViews.

BUG= 642571 

Review-Url: https://codereview.chromium.org/2297973002
Cr-Commit-Position: refs/heads/master@{#415815}

[modify] https://crrev.com/3d927e7a3cf8aec8832391396ae8c99750229345/media/base/media_switches.cc
[modify] https://crrev.com/3d927e7a3cf8aec8832391396ae8c99750229345/media/base/media_switches.h
[modify] https://crrev.com/3d927e7a3cf8aec8832391396ae8c99750229345/media/blink/webmediaplayer_impl.cc
[modify] https://crrev.com/3d927e7a3cf8aec8832391396ae8c99750229345/media/blink/webmediaplayer_impl.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/99fce27763b037227011e357502b1c700477d153

commit 99fce27763b037227011e357502b1c700477d153
Author: sandersd <sandersd@chromium.org>
Date: Thu Sep 01 00:59:00 2016

Add testing config for OverlayFullscreenVideo.

BUG= 642571 

Review-Url: https://codereview.chromium.org/2291413002
Cr-Commit-Position: refs/heads/master@{#415825}

[modify] https://crrev.com/99fce27763b037227011e357502b1c700477d153/testing/variations/fieldtrial_testing_config_android.json

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4e36c9cd407f42368f7d2f5df5806a33303187b8

commit 4e36c9cd407f42368f7d2f5df5806a33303187b8
Author: sandersd <sandersd@chromium.org>
Date: Fri Sep 02 23:51:12 2016

Revert of Add testing config for OverlayFullscreenVideo. (patchset #1 id:1 of https://codereview.chromium.org/2291413002/ )

Reason for revert:
Turns out we shouldn't do this for optimization experiments, since we don't actually want this enabled for all dev builds.

Original issue's description:
> Add testing config for OverlayFullscreenVideo.
>
> BUG= 642571 
>
> Committed: https://crrev.com/99fce27763b037227011e357502b1c700477d153
> Cr-Commit-Position: refs/heads/master@{#415825}

TBR=asvitkine@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG= 642571 

Review-Url: https://codereview.chromium.org/2306233002
Cr-Commit-Position: refs/heads/master@{#416397}

[modify] https://crrev.com/4e36c9cd407f42368f7d2f5df5806a33303187b8/testing/variations/fieldtrial_testing_config_android.json

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4e36c9cd407f42368f7d2f5df5806a33303187b8

commit 4e36c9cd407f42368f7d2f5df5806a33303187b8
Author: sandersd <sandersd@chromium.org>
Date: Fri Sep 02 23:51:12 2016

Revert of Add testing config for OverlayFullscreenVideo. (patchset #1 id:1 of https://codereview.chromium.org/2291413002/ )

Reason for revert:
Turns out we shouldn't do this for optimization experiments, since we don't actually want this enabled for all dev builds.

Original issue's description:
> Add testing config for OverlayFullscreenVideo.
>
> BUG= 642571 
>
> Committed: https://crrev.com/99fce27763b037227011e357502b1c700477d153
> Cr-Commit-Position: refs/heads/master@{#415825}

TBR=asvitkine@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG= 642571 

Review-Url: https://codereview.chromium.org/2306233002
Cr-Commit-Position: refs/heads/master@{#416397}

[modify] https://crrev.com/4e36c9cd407f42368f7d2f5df5806a33303187b8/testing/variations/fieldtrial_testing_config_android.json

(Closing in favor of 644371, which tracks the launch of this change.)