[automerge] When adding overlay to a task, emit an immediate inset update 2p: 4eaf3921

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17607621

Bug: 227202029
Change-Id: I2c45b3ab649b4ed2c2074130edd32c9db20d3de7