perfetto: ensure that ftrace descriptor is only built in standalone am: b51ae7be75 am: 49eb5157ee am: 7a8c5dc945 am: 63604c6851
perfetto: ensure that ftrace descriptor is only built in standalone am: b51ae7be75 am: 49eb5157ee am: 7a8c5dc945
am: 63604c6851

Change-Id: I8289cdac83890204a33734ee94f458fecae55dc5

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto