Timeout waiting for child.

Bug: 183053012
Bug: 181031512
Test: tools/java_heap_dump -n system_server
Test: add 10s sleep to child
      tools/java_heap_dump -n system_server
      perfetto_hprof: perfetto_hprof child timed out. Sending SIGKILL.
Change-Id: I6371374e0bcc596a748e6cdba95397a2ee50d486
1 file changed