The integration of this ad break.
Optional omidOptional settings object for mapping verification vendors (google.ima.OmidVerificationVendor) to OMID Access Modes (google.ima.OmidAccessMode).
Optional replaceWhether the ad replaces playback of the content.
 - When the ad ends, the content will resume at the ad break's offset plus its duration.
 - true for live content,
 - false for VOD content
The source of the ad
 - VAST, VMAP and VPAID are supported.
Optional timeOffset after which the ad break will start.
Possible formats:
 - A number for the offset in seconds.
 - 'start' for a preroll.
 - 'end' for a postroll.
 - 'HH:MM:SS.mmm' for a timestamp in the playback window.
 - A percentage string (XX%) for a proportion of the content duration.
 - A timestamp which is not in the playback window will result in the ad break not being started.
 - VMAP resources will ignore this value as they contain an internal offset.
'start'
Describes a Google IMA ad break request.