Merge "Ensure onTypingHintChanged run on UiThread" into udc-qpr-dev am: c76987749e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24664069

Change-Id: I6d83e972d703fc62bd918be2253c7b967ccdfff6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>