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Rebased on top of https://chromium-review.googlesource.com/c/chromium/src/+/2502628

UI without audio capture: https://drive.google.com/file/d/1SA9vuDOkQjnioBfmAaiOjqoXGBUmVw22/view?usp=sharing
UI with audio capture: https://drive.google.com/file/d/1jcncgHsF6L_o3D5Jc3UJ6pkjwQAKtoVl/view?usp=sharing

This change relates to the UI code that is added to support the new getCurrentBrowsingContextMedia API.

This is an API for capturing the current tab.

Design doc:
go/get-current-browsing-context-media

Intent-to-Prototype:
https://groups.google.com/u/3/a/chromium.org/g/blink-dev/c/NYVbRRBlABI/m/MJEzcyEUCQAJ

PR against spec:
https://github.com/w3c/mediacapture-screen-share/pull/148


Bug: 1136942

Change-Id: I8e72023d944df3d7e996ad3acea7527c34569868
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2489991
Commit-Queue: Palak Agarwal <agpalak@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: Elad Alon <eladalon@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831017}