Merge "Calculates the window height fraction on screen by the draggable bounds...

Merge "Calculates the window height fraction on screen by the draggable bounds for magnification switch button" into sc-dev am: 70aaf815 am: 2ad33446 am: 1b9697b1

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

Change-Id: I2cb10aef20e9b5026d95f99b9a3309b2a8d3ed93