Fix ripples projecting to scrolled view

bug:16873774

1) Fix projectionReceiveIndex, which could in some cases point at
translate/restore ops.

2) Use background translateX / translateY for projected RenderNodes.
This makes them match background position, and thus properly account
for scroll.

Change-Id: Idbd5700858fd67c5abea0270a1012952fe09ac22
3 files changed