Reland "The very first version of a new SkText API."

This reverts commit efb7ae16dd67d0e6743a9b8170121abf56928ac1.

Reason for revert: Excluding all non-linux tests

Original change's description:
> Revert "The very first version of a new SkText API."
>
> This reverts commit 8a20cea604ebedb6d51472f08af425e253646674.
>
> Reason for revert: Breaking some tests
>
> Original change's description:
> > The very first version of a new SkText API.
> >
> > SkText public API added.
> > Interface.h updated.
> >
> > Change-Id: I82a87f33e6cf1394fa2520387f6895d33601376e
> > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/442003
> > Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
> > Commit-Queue: Julia Lavrova <jlavrova@google.com>
>
> Change-Id: I879b198bc6fb44c46d11d967118f8d69eb74fee0
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/449296
> Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
> Reviewed-by: John Stiles <johnstiles@google.com>
> Commit-Queue: Julia Lavrova <jlavrova@google.com>

Change-Id: Ieb65b45532d8c7455f091cf7a9e21fa7dea47606
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/449297
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: Julia Lavrova <jlavrova@google.com>
25 files changed