Merge "ActivityManager: Include Private Dirty Pages in Meminfo" into main am: dff1d0ff am: eb4056b0 am: e0322e86

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2853847



Change-Id: I440aaf537f81f549e9205a36a0731c27594743a3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>