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These changes are in part related to handling playback of mixed clear and encrypted content, where we might want to use a secure decoder throughout, but only have drm init data and only care about the state of the DrmSession during playback of encrypted parts. - requiresSecureDecoderComponent became unnecessary when we added ExoMediaCrypto, which provides a layer in which requiresSecureDecoderComponent can be overridden. - Relaxed requirements for obtaining the MediaCrypto. It's helpful to allow retrieval in the error state, since it can be used to instantiate a decoder and play clear samples. - Deferred throwing of errors in renderer implementations. As long as we can get a MediaCrypto, we should init the codec. We can also play clear samples without failing if playClearSamplesWithoutKeys is true, regardless of the errors state. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=160536365