- // Initializes the Renderer, executing |init_cb| upon completion.
- // If initialization failed, fires |error_cb| before |init_cb|.
+ // Initializes the Renderer with |demuxer_stream_provider|, executing
+ // |init_cb| upon completion. If initialization failed, fires |error_cb|
+ // before |init_cb|. |demuxer_stream_provider| must be valid throughout the
+ // lifetime of the Renderer object.