[automerger skipped] Merge "Purge unused native memory  before Zygote fork events" am: 0b242c8d77 am: c1fa69a24d am: 002ddf496b -s ours
am skip reason: Change-Id I52f72a5a02182a9e2748f7f87b45665059d9891a with SHA-1 7699d61bc5 is in history

Change-Id: Ic674f996d83ab0c2be956e42f6aa0ccec6cd7a39