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This CL sets up the origin trial feature name "WebHID" and
modifies WebHID permissions UI in preparation for an
origin trial.

* WebHID settings is visible by default in Site Settings
* Site settings includes granted HID devices

Intent to Experiment thread:

https://groups.google.com/a/chromium.org/g/blink-dev/c/LoyzK8xTRME

BUG=1038966

Change-Id: I16f52e3c8d112f1f173c62a5a9fe073106e1560e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1985174Reviewed-by: dpapad <dpapad@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Theodore Olsauskas-Warren <sauski@google.com>
Commit-Queue: Matt Reynolds <mattreynolds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782095}