Update Dalvik process state through VMRuntime.

We now update Dalvik's process state through VMRuntime when the
process state changes in ActivityThread. This is used to determine
when to do trimming and will be used to determine when to do
compaction in the near future.

Bug: 8981901

Change-Id: I5eea272ba4ec2d1ed789b058d6457cb3c1fcf777