[Sheriff] vr tests are failing on Mac bots.

The following tests are failing on mac bots:
https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=webkit_layout_tests&tests=vr%2F
* vr/events_vrdisplayactivate.html
* vr/events_vrdisplaypresentchange.html
* vr/exitPresent_resolve.html
* vr/getLayers_notpresenting.html
* vr/getLayers_presenting.html
* vr/getLayers_presenting_nondefaultbounds.html
* vr/getLayers_update.html
* vr/requestAnimationFrame_consistentTimestamps.html
* vr/requestAnimationFrame_handoff.html
* vr/requestAnimationFrame_submitFrame_combinations.html
* vr/requestPresent_resolve.html
* vr/requestPresent_resolve_repeatwithgesture.html
* vr/requestPresent_resolve_repeatwithoutgesture.html
* vr/requestPresent_resolve_then_reject.html

Bug: 914134
Change-Id: I07abd2c60026135b52d7ea47878bad14c823046e
Tbr: estade@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1757409Reviewed-by: Takashi Sakamoto <tasak@google.com>
Commit-Queue: Takashi Sakamoto <tasak@google.com>
Cr-Commit-Position: refs/heads/master@{#688445}

third_party/blink/web_tests/TestExpectations

@@ -6496,3 +6496,18 @@ crbug.com/979298 [ Mac ] virtual/audio-service/media/video-persistence.html [ Pa
 crbug.com/979298 [ Mac ] virtual/audio-service/media/video-zoom.html [ Pass Failure ]
 
 crbug.com/986019 virtual/threaded/animations/play-state.html [ Pass Failure ]
+
+crbug.com/914134 [ Mac ] vr/events_vrdisplayactivate.html [ Failure ]
+crbug.com/914134 [ Mac ] vr/events_vrdisplaypresentchange.html [ Failure ]
+crbug.com/914134 [ Mac ] vr/exitPresent_resolve.html [ Failure ]
+crbug.com/914134 [ Mac ] vr/getLayers_notpresenting.html [ Failure ]
+crbug.com/914134 [ Mac ] vr/getLayers_presenting.html [ Failure ]
+crbug.com/914134 [ Mac ] vr/getLayers_presenting_nondefaultbounds.html [ Failure ]
+crbug.com/914134 [ Mac ] vr/getLayers_update.html [ Failure ]
+crbug.com/914134 [ Mac ] vr/requestAnimationFrame_consistentTimestamps.html [ Failure ]
+crbug.com/914134 [ Mac ] vr/requestAnimationFrame_handoff.html [ Failure ]
+crbug.com/914134 [ Mac ] vr/requestAnimationFrame_submitFrame_combinations.html [ Failure ]
+crbug.com/914134 [ Mac ] vr/requestPresent_resolve.html [ Failure ]
+crbug.com/914134 [ Mac ] vr/requestPresent_resolve_repeatwithgesture.html [ Failure ]
+crbug.com/914134 [ Mac ] vr/requestPresent_resolve_repeatwithoutgesture.html [ Failure ]
+crbug.com/914134 [ Mac ] vr/requestPresent_resolve_then_reject.html [ Failure ]