Merge "initialize mNeedGC" am: 459b4e912f

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2251937

Change-Id: I358f656f43f2159fb34617e85232a3a87dbab518
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>