[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: 18731b00 -s ours

am skip reason: subject contains skip directive

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



Change-Id: I405f79270a861c903b610dbfc66b90d3159cfa3f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>