tree 4a27924e96a0d1a3bfad9f2eaee99debe40dadc0
parent b00486f17c0085f9793a607770573ecd56d2287c
author Misha Dynin <dynin@google.com> 1447295773 -0800
committer Misha Dynin <dynin@google.com> 1447438802 +0000

In the Slideshow view, use thumbnails of previous and next slides
for navigation.  If the previous/next slides are missing, display
a placeholder.

Change-Id: I6aa0bf9c041962915e5a4e5b9956cce5a8396074