impl ppb_audio_input_dev_create
fill default parameters in ppb_url_request_info_create
store request info parameters in url_request
add header parser
add redirection handling to ppb_url_loader
impl ppb_url_loader_follow_redirect
report total_bytes_to_be_received if known in ppb_url_loader_get_download_progress
call callback just after headers receive and fix async reads in url_loader