Merge "Add widget flag in CoreSettingObserver" into udc-qpr-dev am: 9dc442bff2 am: cfcb4eefc5

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24360625

Change-Id: Iaf76483cfccbf8ff066aafe326208475f7105e47
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>