Improve ANR diagnostics.

When an ANR occurs, log the associated reason.

When an event takes too long to process (currently more than 2 seconds)
log basic information about the event including how long it actually
took.

Dump the contents of the inbound, outbound and wait queues as part
of dumpsys input.

Bug: 6574842
Change-Id: I9ab754c320f609cb86fe266c469a61e7032dfed6