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This adds coverage via the clearkey CDM to ensure that the output protection query is working as intended. These tests ensure that the output protection machinery recognizes when browsers windows are being captured, and this is reflected by the clear key CDM changing key status on a test key id. Two cases are covered: 1. Media playback is started, then during media playback a screen capture is started and stopped. The test checks that we set restricted key status while capture is active, and stop doing so once the capture stops. 2. Start a screen capture then start media playback, then stop capture while playback is still active. This is similar to the first case, but the media should start in a restricted state, as capture is ongoing when playback starts. Differential Revision: https://phabricator.services.mozilla.com/D122784