Merge "Call listener onConnected method when connection starts." into ub-launcher3-master am: 9c6946dd92

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/WallpaperPicker2/+/11803803

Change-Id: I683e0d7a0085d882f5847b07839520fd3efa724a