Findit identified the culprit r624115 as introducing flaky test(s)
summarized in https://findit-for-me.appspot.com/waterfall/flake/flake-culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyQwsSDEZsYWtlQ3VscHJpdCIxY2hyb21pdW0vZjA5ZTQ0NmU0YTVhOTA1ZTk3MjA3NGMyZmM0NzAwYTMxNTMzZjI1ZQw

Please revert the culprit or disable the test(s) asap. If you are the owner,
please fix!

If the culprit above is wrong, please file a bug using this link:
https://bugs.chromium.org/p/chromium/issues/entry?status=Unconfirmed&labels=Pri-1,Test-Findit-Wrong&components=Tools%3ETest%3EFindit%3EFlakiness&summary=%5BFindit%5D%20Flake%20Analyzer%20-%20Wrong%20culprit%20r624115&comment=Link%20to%20Culprit%3A%20https://findit-for-me.appspot.com/waterfall/flake/flake-culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyQwsSDEZsYWtlQ3VscHJpdCIxY2hyb21pdW0vZjA5ZTQ0NmU0YTVhOTA1ZTk3MjA3NGMyZmM0NzAwYTMxNTMzZjI1ZQw

Automatically posted by the findit-for-me app (https://goo.gl/Ot9f7N).

Clearly caused by r624115 but the revert doesn't apply cleanly with r624017, r624125, and r624133 on top. Will disable test for now.

@Francois please address when you're back online.

https://chromium-review.googlesource.com/c/chromium/src/+/1422920 should fix it.

 Issue 923529  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/63a9d4a9314680abbab05f4263c91cf31598e7ad

commit 63a9d4a9314680abbab05f4263c91cf31598e7ad
Author: Gabriel Charette <gab@chromium.org>
Date: Fri Jan 18 22:25:06 2019

Disable flaky WebAppPictureInPictureWindowControllerBrowserTest.AutoPictureInPictureWhenPictureInPictureWindowAlreadyVisible on Windows

crrev.com/624115 is at fault but it's behind a stack of 3 other CLs and
thus hard to revert. Let the owners try to fix and re-enable the test
instead of reverting everything.

TBR=beaufort.francois@gmail.com, haraken@chromium.org, mlamouri@chromium.org

Bug:  923428 
Change-Id: I6ffe0728cca31f1924085b22c90307557ccd44bb
Reviewed-on: https://chromium-review.googlesource.com/c/1422382
Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#624322}
[modify] https://crrev.com/63a9d4a9314680abbab05f4263c91cf31598e7ad/chrome/browser/picture_in_picture/picture_in_picture_window_controller_browsertest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d86aa3d6a8bdd4a93541fe6eb46f35322664fd64

commit d86aa3d6a8bdd4a93541fe6eb46f35322664fd64
Author: Gabriel Charette <gab@chromium.org>
Date: Fri Jan 18 23:48:31 2019

Disable flaky WebAppPictureInPictureWindowControllerBrowserTest.AutoPictureInPicture

Findit spotted that this has the same issue as
WebAppPictureInPictureWindowControllerBrowserTest.AutoPictureInPictureWhenPictureInPictureWindowAlreadyVisible

TBR=beaufort.francois@gmail.com, haraken@chromium.org, mlamouri@chromium.org

Bug:  923428 
Change-Id: I5f95df17d0d5e912e09d7e8de1dd7a2dc82946e7
Reviewed-on: https://chromium-review.googlesource.com/c/1423419
Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624359}
[modify] https://crrev.com/d86aa3d6a8bdd4a93541fe6eb46f35322664fd64/chrome/browser/picture_in_picture/picture_in_picture_window_controller_browsertest.cc

 Issue 923769  has been merged into this issue.

 Issue 923641  has been merged into this issue.

 Issue 923609  has been merged into this issue.

FindIt reported that these tests are also flaky from that change. See merged issues for FindIt's reports.

- WebAppPictureInPictureWindowControllerBrowserTest.AutoPictureInPictureNotTriggeredOnPageShownIfNoAttribute
- WebAppPictureInPictureWindowControllerBrowserTest.AutoPictureInPictureAttributeApplies
- WebAppPictureInPictureWindowControllerBrowserTest.AutoPictureInPictureNotTriggeredOnPageShownIfNotEnteredAutoPictureInPicture

WIP CL at https://chromium-review.googlesource.com/c/chromium/src/+/1422920

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d026613b79fc6e3dbf6bcd3093922a461c21690e

commit d026613b79fc6e3dbf6bcd3093922a461c21690e
Author: François Beaufort <beaufort.francois@gmail.com>
Date: Mon Jan 21 16:27:28 2019

Fix flakyness in Picture-in-Picture browser tests.

Flakyness was caused by video not playing even though video.play() was
called. This CL makes sure test doesn't continue if video is not
actually playing.

Bug:  923428 
Change-Id: I43b814d32add8c8a423d9ad14a6fe494a02bc86a
Reviewed-on: https://chromium-review.googlesource.com/c/1422920
Auto-Submit: François Beaufort <beaufort.francois@gmail.com>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624601}
[modify] https://crrev.com/d026613b79fc6e3dbf6bcd3093922a461c21690e/chrome/browser/picture_in_picture/picture_in_picture_window_controller_browsertest.cc
[modify] https://crrev.com/d026613b79fc6e3dbf6bcd3093922a461c21690e/chrome/test/data/extensions/auto_picture_in_picture/main.html

I believe it's fixed according to https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Win7%20%2832%29%20Tests?limit=100.