Output duration of ftrace as well as total trace duration.
Output duration of ftrace as well as total trace duration.

Bug: 79115781
Change-Id: I0ef096b7ad64e2219d421943e721bdf79a506c69
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto