Merge "Create BIGPICTURE_NOTIFICATION_LAZY_LOADING flag" into udc-dev am: fa2f9840 am: 386d9c54

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23280573



Change-Id: I2fed9d163a42c7a4f7ef8d9305874a606656e5cf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>