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This CL makes some UI changes to how ptz is presented to the user:
- camera is hidden in page info if ptz is granted or blocked
- any change to ptz is reflected on camera
- users see one permission for both camera and ptz when requested
- bubble strings are adjusted when ptz is granted

Screenshots: https://imgur.com/a/tlR4KRr
Test: https://ptz.glitch.me/ w/ Experimental Web Platform Features flag

Change-Id: Ia94c23ae0a79feb6f0744cfd0bc5bc0771604af6
Bug: 934063
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2224214
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#776865}