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Recently a few changes (crrev.com/c/2391767 and crrev.com/c/2399238) entered the AVFoundation capturer, and it's better if these are controlled by a new base::Feature instead of raw changes, because
1) More evolution is expected,
2) We had one regression introduced (crbug.com/1124884#c7).
3) Additionally, this change enables A/B testing in a few months.

The change introduces a new feature kMacNextGenerationCapturer controlling which implementation (default: new capturer) is in use by the system.

The change also dupes the current _mac-suffixed capturer into a new _legacy-suffixed variant.
In future CLs, last weeks evolution to the _mac capturer will be reverted inside the _legacy variant.

Bug: chromium:1126690
Change-Id: I972663eef38623c9a76e0b2424e048bc24fc7093
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401168
Commit-Queue: Markus Handell <handellm@google.com>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Henrik Boström <hbos@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806403}