cc'ing a sheriff; please reassign as appropriate.

Adding SYD sheriff

Sorry, should've labelled from the get-go (updates crossed)

cc-ing authors of Webkit CLs inlcuded in the first failing build.

Can't see a clear connection to the failure though.

Test fails with:
11:06:30.168 3944 worker/0 http/tests/devtools/tracing/timeline-style/timeline-recalculate-styles.js output stderr lines:
11:06:30.168 3944   [7412:4700:0214/110621.337:INFO:media_foundation_video_encode_accelerator_win.cc(370)] Windows versions earlier than 8 are not supported.
11:06:30.168 7432 [5/5] http/tests/devtools/tracing/timeline-style/timeline-recalculate-styles.js failed unexpectedly (text diff)
11:06:30.168 3944 worker/0 http/tests/devtools/tracing/timeline-style/timeline-recalculate-styles.js failed:

Marking this bug as failing for Win7 builds: https://chromium-review.googlesource.com/c/chromium/src/+/921225

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/887ffd23451ea2cd04247841f3422cf1a46112e3

commit 887ffd23451ea2cd04247841f3422cf1a46112e3
Author: Tim Schumann <tschumann@chromium.org>
Date: Thu Feb 15 12:05:49 2018

mark timeline-recalculate-styles.js as failing on win7

TBR=alph

Bug:  812417 
Change-Id: I620e5cf3455b0d40efe1044820cece66e202c670
Reviewed-on: https://chromium-review.googlesource.com/921225
Reviewed-by: Tim Schumann <tschumann@chromium.org>
Commit-Queue: Tim Schumann <tschumann@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536995}
[modify] https://crrev.com/887ffd23451ea2cd04247841f3422cf1a46112e3/third_party/WebKit/LayoutTests/TestExpectations