GitLab

The progression is seen in fast/text/ellipsis-at-edge-of-rtl-text-in-ltr-flow.html
and fast/css/text-overflow-input.html. We also now show an exta character of
text before the ellipsis where space is available.

BUG=650083

Review-Url: https://chromiumcodereview.appspot.com/2392433002
Cr-Commit-Position: refs/heads/master@{#426997}