D20725: Support "stop" Media Sessions action handler

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, fvogt.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  This was recently added to the spec [1].
  
  [1] https://github.com/WICG/mediasession/commit/3d0f74b2dc48f59090a6ba4b766313716453570f

TEST PLAN
  Typed `navigator.mediaSession.setActionHandler("stop", () => console.log("stop"));` into dev console, right clicked media controller applet, clicked "Stop", had it print "stop" on dev console

REPOSITORY
  R856 Plasma Browser Integration

REVISION DETAIL
  https://phabricator.kde.org/D20725

AFFECTED FILES
  extension/content-script.js

To: broulik, #plasma, fvogt
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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