Reland "Small changes for SkText that are not in experimental directory"

This reverts commit 481a58dfe0eddd6736885b324d3cf14f5c10addb.

Reason for revert: Fixing the build

Original change's description:
> Revert "Small changes for SkText that are not in experimental directory"
>
> This reverts commit 92f1bc0083bf2fa1d7eca2857c0d837a8dcf1f17.
>
> Reason for revert: Blocking Android roll.
>
> Original change's description:
> > Small changes for SkText that are not in experimental directory
> >
> > (also made utf 8<->16 conversion static on SkUnicode)
> >
> > Change-Id: Ie64d18ad21a35ec10bd0b350fb7887fb78a419d8
> > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/448140
> > Reviewed-by: Mike Reed <reed@google.com>
> > Commit-Queue: Julia Lavrova <jlavrova@google.com>
>
> Change-Id: Ieb9eb0495dddfc0f9e9e74861b24efc0201fd520
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/448656
> Auto-Submit: Brian Osman <brianosman@google.com>
> Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
> Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>

Change-Id: I1e5859c9dd943c701d4c4e648bdc3e44412eca54
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/448676
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Julia Lavrova <jlavrova@google.com>
6 files changed