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