[skwindow] Revisit naming
To minimize disruption as more files are being migrated from sk_app to
window, restore the original file and class names.
Add a `skwindow` namespace for public APIs (originally 'sk_app'), and
place private classes in `skwindow::internal`.
Also switch the context factories namespace from
`window_context_factory` to `skwindow`.
Change-Id: Ice60e80171850579de97152bf4aef8cdf4f0c090
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/688097
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Jorge Betancourt <jmbetancourt@google.com>
18 files changed
