GitLab

The implementation of LineBreaker is mostly a straightforward
porting of RenderTextWin's implementation.

BUG=248597
R=ckocagil@chromium.org, msw@chromium.org
TEST=manually, customized ash_shell

Review URL: https://codereview.chromium.org/882643005

Cr-Commit-Position: refs/heads/master@{#315010}