Affected tests include: compositing/geometry/object-clip-rects-assertion.html http/tests/inspector/appcache/appcache-iframe-manifests.html http/tests/inspector/network/async-xhr-json-mime-type.html http/tests/inspector/network/network-cachedresources-with-same-urls.html http/tests/inspector/network/network-content-replacement-xhr.html http/tests/security/escape-form-data-field-names.html http/tests/security/feed-urls-from-remote.html http/tests/security/referrer-policy-redirect-link.html platform/chromium/virtual/gpu/fast/canvas/imagedata-contains-uint8clampedarray.html platform/chromium/virtual/gpu/fast/canvas/webgl/webgl-composite-modes-repaint.html There may be several different bugs here (e.g. inspector, GPU, etc.). CCing some people who are familiar with some of these areas.
Any ideas about when this started? Is it just one bot, or many?
I got the test list from the union of all the Chromium Windows canary bots. Most of these looked like they'd been problematic for some time. You can take a look on the flakiness dashboard for ToT Chromium to see what I saw.
object-clip-rects-assertion.html sometimes crashes on Windows. Here is the flakiness dashboard. http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=compositing%2Fgeometry%2Fobject-clip-rects-assertion.html
Marked LayoutTest bugs, bugs with Chromium IDs, and some others as WontFix. Test failure bugs still are trackable via TestExpectations or disabled unit tests.