Integration of mock sensor type

[Honry]

Fixes part of w3c/sensors#378

---

Preview | Diff

[Honry]

@anssiko and all, PTAL. Thanks!

[anssiko]

Seems good to me.

@reillyeon please take a look too.

[reillyeon]

It's unfortunate we can't extend an enum from a separate specification.

[anssiko]

Yes, partial enum is still not a thing. The topic been discussed in this group earlier w3c/sensors#22 (comment)

[Honry]

@anssiko, @reillyeon, many thanks for your review!
Seems the enum is still non linkable, any idea?

[anssiko]

@Honry bikeshed update --anchors will fix it, see https://tabatkins.github.io/bikeshed/#cli-update

The --anchors flag will update your local Bikeshed "anchor data" to the latest that includes "ambient-light" enum, see https://github.com/tabatkins/bikeshed-data/blob/master/data/anchors/anchors-am.data#L1

Please create a PR to update this spec and also update the other PRs for other concrete specs accordingly.

[anssiko]

@Honry since the other PRs did not have any enum linking errors, you probably updated the anchor data between the builds?

[Honry]

Oh, I find the root cause now, I did't update the anchor data between the builds, I will do that for all PRs.