From the dashboard:

First timeout occurred in https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7/builds/55715

First timeout-pass was in
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7/builds/55696

After that there is no data.

There are also some timeouts on WebKit Win10 builder, e.g. https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win10/builds/25769

Disabling the test in https://chromium-review.googlesource.com/c/chromium/src/+/674874.

chenwilliam@, you worked on this file recently, could you redirect please?

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/50fbbb9b76b493c9b500a0c3a8a21ce66e41e702

commit 50fbbb9b76b493c9b500a0c3a8a21ce66e41e702
Author: Vitalii Iarko <vitaliii@chromium.org>
Date: Wed Sep 20 13:03:03 2017

Disable v/m/h/t/d/startup/console-log-before-frame-navigation.html.

Disable virtual/mojo-loading/http/tests/devtools/startup/console-log-before-frame-navigation.html (expect timeouts), because it timeouts flakily on WebKit Win7 and Win10 builders.

No-Tree-Checks: true
No-Try: true
TBR: dgozman@chromium.org
Bug:  767012 
Change-Id: Ibf4b8c36df50dd85669c8a6034b8324f67a5a5cc
Reviewed-on: https://chromium-review.googlesource.com/674874
Reviewed-by: vitaliii <vitaliii@chromium.org>
Commit-Queue: vitaliii <vitaliii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#503122}
[modify] https://crrev.com/50fbbb9b76b493c9b500a0c3a8a21ce66e41e702/third_party/WebKit/LayoutTests/TestExpectations

Hi Rune, 

There are multiple flakes since your change (https://chromium-review.googlesource.com/c/chromium/src/+/661957).

Could you investigate whether your change could be responsible?

@mathp: How was that rev identified as a possible culprit? Is there a revision range? It does not sound very likely. The test finishes really quickly on Linux here. I don't have a Windows to test with.

This test is also timing out every so often on Win10: https://uberchromegw.corp.google.com/i/chromium.webkit/builders/WebKit%20Win10/builds/25824

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/006dbcc14be9e7ae6960fbe2c0e9a7bd458066a7

commit 006dbcc14be9e7ae6960fbe2c0e9a7bd458066a7
Author: Elly Fong-Jones <ellyjones@chromium.org>
Date: Thu Sep 21 14:09:52 2017

sheriff: mark console-log-before-frame-navigation.html timeout on win10

Bug:  767012 
Change-Id: Idf27d402c79eb189c1c2cf307197dae6dd525e63
TBR: dgozman@chromium.org
No-Tree-Checks: true
Reviewed-on: https://chromium-review.googlesource.com/676652
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#503438}
[modify] https://crrev.com/006dbcc14be9e7ae6960fbe2c0e9a7bd458066a7/third_party/WebKit/LayoutTests/TestExpectations

See also  Issue 777222