// Helper function for OnNewBuffers() when new text buffers have been parsed.
// It applies |timestamp_offset_| to all buffers in |buffers| and then appends
// the (modified) buffers to the demuxer stream associated with
// Helper function for OnNewBuffers() when new text buffers have been parsed.
// It applies |timestamp_offset_| to all buffers in |buffers| and then appends
// the (modified) buffers to the demuxer stream associated with