73894964c2
-> Caching values of getChildOffset() and getChildRelativeOffset()
-> Using fast invalidate pattern in workspace#screenscrolled
-> eliminated updateAdjacentPageAlpha, combined with screenScrolled
code where appropriate to take advantage of fast invalidate
-> removed a bit of dead code (just for cleanups sake)
Change-Id: Id91542ff846d9495a0370707d02d1f647dab22d4