Google Chief Executive Officer Sundar Pichai is about to have a very big week. On Wednesday, an award of 353,939 restricted shares he received before a promotion in 2014 will vest. At the end of last week, the grant was worth about $380 million, making it one of the largest single payouts to a public company executive in recent years, according to data compiled by Bloomberg. Pichai, 45, who has led Alphabet Inc.’s Google since 2015, received the shares before his promotion to senior vice president of products a year earlier, when he took over many of co-founder Larry Page’s responsibilities.