Merge "Prevent starting split pending transition when it exists" into udc-dev am: 56557a6f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22221903



Change-Id: Ib42fc23e19183bfbb71bacf9b6f35ee0f1e5d2ff
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>