PSS changes don't seem to be non-noise.

Changed the process slightly, the threshold for persistent processes or
foreground processes is 3. The threshold for other apps is 10. The
reasoning for this is that these apps are always running so their
classes should be weighted more heavily.

The processes that had increased weighing were:
system
com.android.systemui
com.android.phone
com.android.nfc
com.google.android.apps.nexuslauncher
com.google.android.gms
com.google.android.gms.persistent
com.google.android.inputmethod.latin

Preloaded classes: 4148 -> 4592
Compiled classes: 8677 -> 8524
Boot.oat size: 45474248 -> 45434448
Boot.art size: 13615104 -> 13733888

Bug: 34890992
Bug: 37689251
Test: N6P boots

Change-Id: Ief81bfb6d8ae2d971b85bf3e5e9ff11cb2236bab