Using getDisplayMedia inside of Offscreen Document won't focus/select target tab.

[Messiah Cheng]

Hello everyone, please help me, I'm make a screen recorder chrome extension and met this big question.

Inside of normal html document, using getDisplayMedia will auto focus the target tab, while inside offscreen document it doesn't work.

Maybe i can use chrome.tabs.update to select the target tab, but it's so sad that i can't access the tab id of mediaStream which return by getDisplayMedia...

[Patrick Kettner]

Hi Messiah!

It looks like this is a relatively long standing issue - crbug.com/1275989. However, as a result of your message I was able to dig in a bit and locate the specific CL that introduced the problem. You can star that issue to raise it's priority and follow along with progress. Since it is a web API (rather than an extension specific one) I don't believe there is a clear way to associate the selected tab MediaStream with a tabID (the later of which is an extension specific concept). You could open a feature request with the WICG to start discussion around supporting it, but I think getting the above bug fixed is likely the best path forward.

patrick 

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