Merge "Add Touch Initiation Regions." into tm-dev am: ffe63c3182 am: b8afa916f3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16946810

Change-Id: I5e8151d5e86c5db62bb4fafd33b4fa31f384e3e5