Merge "Generate a new id for each window" into rvc-dev am: c0a8645e4e am: 71366b00c0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/11388490

Change-Id: I8fc73a4fb41b19c8a6c6d8531043d9ffcb2ba0da