Add shadows back to bubble avatar
* Add shadows back -- icon lib is no longer adding shadows but
bubbles should still have them for background protection.
* The shadow is active on all bubbles when:
- the stack is being dragged around & bubbles trail behind it
- the stack is expanded (the bubbles can be dragged to dismiss &
can show on top of the expanded view or overflow)
* When the stack is resting, only the top two bubbles show a shadow
& the bubbles below that animate their Z translation so the change
is smooth.
* Also put the # of bubbles we show in the stack in a static int &
updated usages
Test: visual - add 5 of the 'test bubbles' from the test app
and notice the white backgrounds don't blend together
due to the shadow & that they are distinct when
placed on a white background
- drag / fling the stack around & notice shadows show
for all the bubbles while moving but once they come
to rest you don't see a stack of shadows
Bug: 183657577
Change-Id: I0c273f4d0261db9eac1b49ef584fd62fbb67cc9a
6 files changed