Send SIGQUIT when finalizer times out

The motivation is to get a native stack trace of the thread if it
is stuck in native code when runing a finalizer. Idea from agampe.

(cherry picked from commit b9f954826c2e81667f5aa466aa3084f789c384fb)

Bug: 21060358
Change-Id: I370988e6a0067e1d407c21881c82e49b6adec050
1 file changed