Merge "Add searchable metadata attribute for injected tiles." into udc-qpr-dev am: ebe56890

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24755218



Change-Id: I1c5d3f8d16f02f3f622d070127189bcc0f11d9a8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>