[automerger skipped] [DO NOT MERGE] Add placeholder when media control title...

[automerger skipped] [DO NOT MERGE] Add placeholder when media control title is blank am: 965e5146 am: 6e5985e4 -s ours am: 03845c01 -s ours

am skip reason: subject contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23517237



Change-Id: I8a14dca48ec2cf37cbf68a554101c87cee878684
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>