ui: Avoid '[NULL]' for unnamed global tracks am: 781bc4dd9b
ui: Avoid '[NULL]' for unnamed global tracks am: 781bc4dd9b

Original change: https://android-review.googlesource.com/c/platform/external/perfetto/+/1676223

Change-Id: If2ead622705f33731ab51a2d2eb8f085d1371005

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