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This is a reland of [1] reverted in [2]. The test failure comes from [3]
that got merged a few minutes before [1]. The test expectations are now
updated to work with the changes brought by [3] to paragraphs break
heuristics.

[1] Original CL: crrev.com/753f8707
[2] Reverted in: crrev.com/003b20ab
[3] Caused by: crrev.com/f39b7b73

Original change's description:
> PDF a11y: kTextDirection attribute support
>
> The text direction attribute is now properly set for text runs in PDF.
> It is inferred by the position of the first and the last characters of
> a text run.
>
> This change includes a pdf-template file (text-direction.in) with RTL
> text representation used to generate our unit test PDF file.
>
> Bug: 985604
> Change-Id: If5d82296463331e95c4ded4e5244d65be3fbadfa
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1737019
> Commit-Queue: Benjamin Beaudry <benjamin.beaudry@microsoft.com>
> Reviewed-by: Lei Zhang <thestig@chromium.org>
> Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
> Cr-Commit-Position: refs/heads/master@{#690163}

Change-Id: Ic8b7e62d1bce71db39af01473a66ea033aeaf7a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1771551
Commit-Queue: Benjamin Beaudry <benjamin.beaudry@microsoft.com>
Commit-Queue: Kevin Babbitt <kbabbitt@microsoft.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#690395}