Symptom: Unable to kill by Am again and will be skipped updating its oom adj.
Root Cause:
A restarted process will reuse original process record.
The flag killedByAm will keep previous state.
Solution:
Reset the flag killedByAm to false when the process is started.
Note: Found another similiar patch If95137d91939cc44882ad2813131bcde0edd0c1b
Change-Id: I59a86648ca8d0aed4c489d92751af120aae5ef90