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These set of tests pass in Firefox but not in Chromium.
They check what happens when you scroll an element with
"text-overflow: ellipsis", right now in Chromium
the rest of the content of the element is not visible at all
(once truncated the text ellipsis is not moved).

The solution would be to force a relayout during scrolling
but it seems we prefer to keep current behavior to avoid
performance issues on scrolling.
The behavior is not mandatory according

Both behaviors are allowed in the spec, so the tests are marked
with the "should" flag:
https://drafts.csswg.org/css-overflow/#ellipsis-scrolling

Bug=745905
TEST=external/wpt/css/css-overflow/text-overflow-scroll-001.html
TEST=external/wpt/css/css-overflow/text-overflow-scroll-rtl-001.html
TEST=external/wpt/css/css-overflow/text-overflow-scroll-vertical-lr-001.html
TEST=external/wpt/css/css-overflow/text-overflow-scroll-vertical-lr-rtl-001.html
TEST=external/wpt/css/css-overflow/text-overflow-scroll-vertical-rl-001.html
TEST=external/wpt/css/css-overflow/text-overflow-scroll-vertical-rl-rtl-001.html

Change-Id: I975ca86dbdfedf92875c08736539fb2f33f68c54
Bug: 745905
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2113495
Commit-Queue: Koji Ishii <kojii@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753508}