Sample for chrome.offscreen

[An-Yay]

I'd like to write a sample for (chrome.offscreen)[https://developer.chrome.com/docs/extensions/reference/api/offscreen]
The idea would be the following:

1. Click to Capture: Click on the extension icon to open the popup.

2. Select Source: Choose the source (screen, tab, webcam) you want to capture.

3. Stream Display: Stream is displayed in a new window for viewing.

[Ta3344]

#1111 (comment)