UI: make counters deal with negative numbers am: 3dde018645
UI: make counters deal with negative numbers
am: 3dde018645

Change-Id: If267fcdce0d4437b751eea5ea9691a94934b0105

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