heap profile script: Make default duration very long.
heap profile script: Make default duration very long.

traced does not support duration larger than 7 days.

Change-Id: Ia2fd828a64e18a313cad42eac7619d19e90513a1
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto