[Bug 784129] event: make DRM system id optional in GST_PROTECTION event

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784129

--- Comment #3 from y.bandou <bandou.yacine at gmail.com> ---
For the moment, when we have only keyid the protection system is either
Widevine or Clearkey.

In EME: The JS application can choose the protection system, then we can choose
the right decryptor element.

In playbin: We can use the rank, if we prefer a decryptor element than an
other.

For me if the mimetype is webm/mkv and the widevine decryptor element
available, i'll choose widevine.

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