Snapseed is probably a huge part of it (and it's already very much cross-platform). For the other aspects, there are a number of other companies Google might ha

Snapseed is probably a huge part of it (and it's already very much cross-platform). For the other aspects, there are a number of other companies Google might have chosen to acquire instead (Topaz Labs — which would be my choice as a scrappy, lightweight, innovative photo-centric company — Alien Skin, etc.), but they're absent in the mobile space.