Some additional corrections:
While this figure is subject to change, at the time of this video being produced, Memory corruption has been the cause for almost every in-the-wild Zero Day on not just Android but WebKit and Chrome.
Meant to say "this figure" being the Zero Days "In the Wild" spreadsheet by Google which I forgot to link as well. Had originally referenced a security researcher's keynote in my drafts but I thought the spreadsheet would be better.