Fixes user switcher dialog animations. am: 20fd9de94e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20834282

Change-Id: Iec32bd147b95e86c2b53bc20446bb18cf7fd3f9e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>