Merge "Toggle dim according to progress of recents animation" into udc-dev am:...

Merge "Toggle dim according to progress of recents animation" into udc-dev am: f51e5001 am: b94c6db9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23693824



Change-Id: I23c20534e0b4a08045912ad01f3613b4f3b4a230
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>