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This change adds two new Blink runtime feature flags, ScreenWakeLock and
SystemWakeLock. These can be used to control support for the "screen"
and "system" WakeLockType enum values. These checks need to be
implemented by hand in wake_lock.cc since the bindings generator does
not support adding the [RuntimeEnabled] attribute to an enum value.

A webexposed test has been added to check that only the desired wake
lock types are exposed.

Bug: 257511
Change-Id: If9e94eb39bfd98d91c08da89340ff541f471abb3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2081618
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746546}