[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 -s ours am: eaa83901 -s ours am: ec2d4da4 -s ours am: ee66117f -s ours am: 02cdfce4 -s ours

am skip reason: subject contains skip directive

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



Change-Id: I6e35a3edc11ef1de1523526fcfd05fb70c754058
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>