frameworks/base: Watchdog to generate trace of Monkey.

We need stacktrace of Monkey process to debug issues wherein
system_server gets stuck doing a binder call with monkey

Change-Id: Ie0be15662c68219fe5e95592c672b86ab0987e37
(cherry picked from commit c509d1147e321118f1c908502b0b9eb5ee2a5926)
(cherry picked from commit 27638c88997499490e681d8237d7435effe8d4a5)
(cherry picked from commit d29598744ce156917380141944404eb5567bf1d7)