Removes an extra saveLayer call by rendering ripples as overlapping. We are now down to zero saveLayers when drawing unmasked ripples or ripples masked against opaque content/masks, one saveLayer for ripples masked against content and two saveLayers when masked against an explicit mask layer. BUG: 18226391 Change-Id: I0fc09d21fbc462fbcfe4c26fc7b18737f584043e