Merge "Send gesture cancellation on correct thread" into udc-dev am: 2e0f3af1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22299087



Change-Id: I0fff4c5e9367a2a224e100fe8c0230c649d5519f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>