Merge "Ensure the back gesture window is not touchable" into sc-dev am:...

Merge "Ensure the back gesture window is not touchable" into sc-dev am: 4c0f4e3a am: 9f6c848d am: e420b546

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14926475

Change-Id: I03b3966449abad1e36bfa1f562f2d18964452067