Add more test cases of left/right caret movements into inline blocks

This patch adds some more test cases where left/right visual caret
movement moves into an inline block. This is a preparation for
implementing the behavior in BidiCaretAffinity.

Bug: 894651
Change-Id: Ice1fa7a4f27bf7e394627fe5d509369a56a6f71a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1519127
Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#640421}
4 files changed