Add animation to pending snapshot icon
Add animation to pending snapshot icon

By animating the opacity of these icons up and down, we communicate that
something is happening and to watch this space for updates.

Change-Id: Ibe90de307769374d91f9f16fdda586ab1394b58b

kalw/diffux,diffux/diffux,kalw/diffux,kalw/diffux,diffux/diffux,diffux/diffux