Merge "Calculates the window height fraction on screen by the draggable bounds for magnification switch button" into sc-dev am: 70aaf815 am: 2ad33446

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14921895

Change-Id: I6d25afbc1a4caecc2ce2f0f3c8849a1c26df53ab