Merge "Start edge extension animations in sync" into tm-dev am: 7ecba896

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18176062



Change-Id: Ib0a5fe3136200b23b92523adc512e087f6a288cc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>