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In addKey(key) procedure, "did store key" is set to true or false, as can be seen from description, "did store key" is a flag used by CDM, do we really need specify the internal behavior of CDM?
We need to describe when the keyadded event is fired. This pseudo flag is used to represent that case in the algorithm. This is consistent with the style of the existing spec for HTMLMediaElement. Also, there are other locations in the spec that specify the behavior of the CDM as is necessary to satisfy the API.