Endless scrolling for RecycleView and basic interface for FPS measurement

Soc2a
Soc16a
Soc17a [not finished]
Eventually the actual drawing operation should become optional, like it is in the Crosswalk version.

The equivalent in the Crosswalk version is 2x2 and is filled; I don't know offhand what Android's canvas API is like, perhaps a filled rectangle is the closest equivalent?