These patches seem to be causing test_session_scroll_position.html and test_session_scroll_visual_viewport.html to time out: https://treeherder.mozilla.org/#/jobs?repo=try&tier=1&revision=396d148b35471a240f94e6641efca54b3a3b499f
Bug 1509575 Comment 22 Edit History
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These patches seem to be causing `test_session_scroll_position.html` and `test_session_scroll_visual_viewport.html` to time out: https://treeherder.mozilla.org/#/jobs?repo=try&tier=1&revision=396d148b35471a240f94e6641efca54b3a3b499f