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The hit test "point" is not really a point, but a pixel with 1px width
and height. Ignoring this leads to off-by-one errors when converting
a physical point into logical in vertical-rl writing mode.

This patch fixes the issue by using 1px width and height in the
conversion, instead of 0.

Note: This patch contains an all-pass NG baseline because the legacy
baseline contains a failure line.

Bug: 811502
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng;luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ie3f01469b4902c3c9647d40be92ccb9c26467f0d
Reviewed-on: https://chromium-review.googlesource.com/1150814
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578178}