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Pan and Tilt Constraints are part of the UVC spec.
For Linux/CrOS, we can use V4L2 controls like
(V4L2_CID_PAN_ABSOLUTE and V4L2_CID_TILT_ABSOLUTE).

Spec: https://github.com/w3c/mediacapture-image/pull/182

Test Page: https://riju.github.io/WebCamera/samples/panTilt/

Putting Pan/Tilt feature behind a flag:
chrome --enable-blink-features=MediaCapturePanTilt

Intent to Implement and Ship discussions:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/j-Q08QgBipM/F3a5sau1BwAJ


Bug: 934063
Change-Id: I552c4c8be717c3b67c4d91f826a1f16850430fa4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1508519Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Rijubrata Bhaumik <rijubrata.bhaumik@intel.com>
Cr-Commit-Position: refs/heads/master@{#681332}