Merge "Add placeholder when media control title is blank" into tm-dev am: dfc4955c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23502366



Change-Id: I729cb6f6c6dcbe93795cde52577a1cf5f5b2d1e9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>