Declare MediaButtonReceiver for support-mediarouter-v7 testing am: 34bde96f69 am: 6ed1480d8c
Declare MediaButtonReceiver for support-mediarouter-v7 testing am: 34bde96f69
am: 6ed1480d8c

Change-Id: Ie81819e6a5ce1b5200430361154b853f58687e45

androidx/androidx,aosp-mirror/platform_frameworks_support,AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,aosp-mirror/platform_frameworks_support,androidx/androidx,aosp-mirror/platform_frameworks_support,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,aosp-mirror/platform_frameworks_support,androidx/androidx,androidx/androidx,aosp-mirror/platform_frameworks_support,AndroidX/androidx,androidx/androidx,AndroidX/androidx