Variety: Tubular Labs, a four-year-old company that measures cross-platform Internet video viewing and engagement, has raised $10 million in financing led by venture-capital firm Marker to help fuel its push against comScore and Nielsen, two bigger rivals in the audience-measurement business. The round brings the company’s total funding to date to $31 million. Previous investors include FirstMark Capital, Canaan Partners, Lerer Hippeau Ventures and SV Angel.