tonihei 4f640bc62e Add SequencableLoader.isLoading
This method allows the player to figure out whether we still have an ongoing
load even if LoadControl.shouldContinueLoading returns false.

PiperOrigin-RevId: 272445577
2019-10-02 21:30:07 +01:00
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2019-10-02 21:30:07 +01:00