contacts-item: switch to taking a single "model" attribute
Contacts: implement tap-to-activate with crossfade to a contact's details
Don't display menu button when the menu is always visible anyway
Social: remove drawer panel (menu sidebar)

The swipe gesture to open it conflicts pretty badly with
swipe-to-dismiss.
Social: remove tabs
Social: simplify layout
Social: use a more Material-like layout
Contacts: more Material-like layout
Reduce scrollable list entries to 72px per Material guidelines
Add menu to Social app with Refresh and Settings options
contacts-card: populate with UI widgets, get shadow right
my-perf-box: optionally, continuously animate a widget

This means we can use the Chrome developer tools' fps graph
and Chrome's build/android/surface_stats.py for comparison,
without them pausing because no frames get rendered.