The stop string is media_output_dialog_button_stop_casting Bug: 235622493 Test: build pass. Change-Id: I5b74b52f0a8469ae00df7617f40c3993b56503e9 Merged-In: Idd26d2b4e10dfcd00045184ddd2f9815a02ec7ce (cherry picked from commit 04266254083d9117d29173d7e7065273bf5e4507)