Started code to pipe overview events and info to launcher

The first event will have navigationbar send its x and y touch events
with no delay (upon vsync) to launcher so that launcher can detect and
animate a drag gesture.

If the user has provisioned setup, the connection between overview to
launcher service will be establish to send any information as a proxy
through binder calls. Connection will be reattached if device switches
between users. Each failure to connect to launcher service will have an
exponential backoff timeout to reconnect.

To implement call Dependency.get(OverviewProxyService.class) and then
getProxy() to get the proxy to pipe events or other information across
to launcher.

Test: manual
Bug: 67957962
Change-Id: I3828474147c37b2c514a682f9124e29a5e142736