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Change it to return base::Optional<PP_PrivateAccessibilityTextRunInfo>,
instead of returning the individual elements of
PP_PrivateAccessibilityTextRunInfo as out parameters. Update the caller
of GetTextRunInfo() to std::move() the text run into the vector that
holds all the text runs, and simplify calculations for char indices in
the caller.

Change-Id: I719119935ea201f5aed7d1d41e706831a1696c90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1769220
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Ian Prest <iapres@microsoft.com>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#690901}