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This CL makes sure user is prompted with camera PTZ access if any of the
constrained values for pan, tilt, and zoom are present in getUserMedia
options. This CL does not check yet for hardware support. This will come
in a follow-up CL, as well as applying constraints after getUserMedia
succeeds.

The camera PTZ permission request is grouped with camera and microphone
permission requests.

Screenshots: https://i.imgur.com/J9rrWS5.png https://i.imgur.com/aGSUZVY.png
Explainer: https://github.com/w3c/mediacapture-image/blob/master/ptz-explainer.md
Test: https://ptz.glitch.me/

Change-Id: Ia940cd62952d828598203506ea73992ac1e87e73
Bug: 934063
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2127109
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Rijubrata Bhaumik <rijubrata.bhaumik@intel.com>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#766318}