Merge "Create hint session asynchronously" into udc-dev am: 5c406a3c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22951911



Change-Id: Iad5429586b9dcaa8b36477f654235aa36452197b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>