Merge "IME animation: hide IME-related navbar icons until perceptible" into rvc-dev am: e658c76b5c am: f771bf5301 am: c46149e5ee

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11837615

Change-Id: Id9efe1162399b79b2e1b1414461236f1aa972987