Merge "Check task switch by comparing the previous top task" into sc-v2-dev...

Merge "Check task switch by comparing the previous top task" into sc-v2-dev am: 045adab7 am: 8d608eab

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15421190

Change-Id: I85635cec83bf4d3a2773caa153deaa3492e14b59