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TransformScreenToWidgetCoordinates() assumes that coordinates are given
in absolute space, but they are sent by EventSender relative to the main
frame. This caused a number of tests to fail when
--disable-headless-mode was passed due to the offset caused by the
window decorations and tool bar. Add this offset into the calculation.

This doesn't work for OOPIF tests because the main frame is a
WebRemoteFrame object without a corresponding RenderWidget, so the
offset can't be retrieved in the same way. None of these tests are run
out of headless mode, so this should be fine. Mark this expectation for
now.

Bug: 935970
Change-Id: I255cec584fc91176471861b45ab8ff37aade7b39
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1814838Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Sean Gilhuly <sgilhuly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715408}