Merge "Update javadoc to reflect "autofill for all apps" changes." into udc-dev am: 6ddd9681

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23066001



Change-Id: I42c3f3de1f47d1204a7b6db2afe4823b9eed14cf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>