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: 66197596 am: d949fcf3

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

Change-Id: Ic5ba8869bd81ddedabedf727654c10522ba1ed3f