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Determines if platform supports overridden status of permission by
querying PermissionControllerDelegate. Since most delegates have static
permission statuses, this queries the permission status by default.
Overridden classes, such as PermissionManager (used for Chrome) and
WebTestPermissionManager, have dynamic permission settings which are
queried in a different fashion. If permission is not supported, this
is indicated. PermissionControllerImpl, which controls overrides,
uses this decision to choose whether or not to override, which is
then forwarded to the callee. Browser.setPermission uses this to
indicate if setting permission failed/succeeded. Browser.grantPermission
ignores the result.

Design doc: go/chromedriver-permissions-ext

Bug: 976308
Change-Id: I0124ea1b2238a33c379476b74d6ef322327413a2
Tested: Adds unit tests to each affected level.
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1752176
Commit-Queue: Rohan Pavone <rohpavone@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689139}