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Depending on the inlineBox bidiLevel use the right or left offset.
Do not use bidiLevel of the previous box when attribute is auto.

R=eseidel, leviw
BUG=296847
TEST=TextArea with strong RTL word, when on next line LTR word is
entered, caret position is changed.

Review URL: https://codereview.chromium.org/302433015

git-svn-id: svn://svn.chromium.org/blink/trunk@176151 bbb929c8-8fbe-4397-9dbb-9b2b20218538