Merge "Switch to purge all unused memory to kernel." am: 2325b1da am:...

Merge "Switch to purge all unused memory to kernel." am: 2325b1da am: 861aa1f9 am: 2a2807c6 am: c503984e am: cb9cc1e2

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2461533



Change-Id: I6bf31b52fbcb827f498382d18eb731d5ef7c1b00
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>