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According to the design spec of the new policy 'Virtual Keyboard
Features' (go/pwa-api-key-dd), the keyboard features will be disabled by
default in the Web Kiosk session. This is an intended behavior change.

For other sessions, the original behaviors will still remain (i.e.,
enabled by default).

In this cl, some browser tests are added to ensure the following sessions
are correctly impacted (or not impacted) by the new policy.
- Guest session.
- Regular session.
- Chrome App Kiosk session.
- Web Kiosk session.

Bug: 1083893
Change-Id: If627ba3126f47a503f7793d1e7f9211b4f471079
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276278Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Anatoliy Potapchuk <apotapchuk@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Commit-Queue: Anqing Zhao <anqing@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784437}