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This patch changes |ComputeNGLocalCaretRect()| to use text direction of
line box instead of containing block to handle dir=auto correctly to
pass the test "editing/caret/caret-direction-auto.html" for TextAreaNG.

Before this patch, |ComputeNGLocalCaretRect()| limits caret position to
right edge of line box when dir=auto and text content leads direction as
RTL even if direction of line containing caret is LTR.

After this patch, |ComputeNGLocalCaretRect()| uses direction of line to
limit caret position correctly.

Bug: 1137666
Change-Id: Id8c8245833955427b45a286a2d742c6d31d492eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2497962
Commit-Queue: Kent Tamura <tkent@chromium.org>
Auto-Submit: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820682}