How to enable Encrypted Media Extensions in headless mode?

[v.ol...@gmail.com]

I can't manage to run my app with headless chrome that uses EME `window.navigator.requestMediaKeySystemAccess()`.

For instance, clicking on "Make available offline" in this example app (not mine) will work in Desktop Chrome (as long as the user hasn't deactivated chrome://settings/content/protectedContent in their settings), but not on headless chrome:

https://biograf-155113.appspot.com/ttt/episode-2/

Calling `window.navigator.requestMediaKeySystemAccess()` throws a DOMException `Unsupported keySystem or supportedConfigurations`

I couldn't find any documentation stating that these extensions are disabled in headless mode. Maybe I need a flag? How can I know why is it being rejected? For this example, I launched headless mode with:

`chrome --headless --enable-logging --v=1 --remote-debugging-port=9222 https://biograf-155113.appspot.com/ttt/episode-2/`

[Eric Seckler]

Sounds like we're either missing the init of the supported key systems, or are simply failing to enable encrypted media in the first place [1]. Definitely worth filing a bug [2]! Thanks!

[1] https://cs.chromium.org/chromium/src/media/blink/key_system_config_selector.cc?rcl=5c08d895d20dcde58e3f33ca3f68f52df03386b1&l=849

[2] https://bugs.chromium.org/p/chromium/issues/entry?components=Internals%3EHeadless

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