client lib: Add a DCHECK to ThreadTracks for tid != 0 am: 311b3607cf am: 4c346e7d89 am: 6d4d6152c2 am: 35e071c40b
client lib: Add a DCHECK to ThreadTracks for tid != 0 am: 311b3607cf am: 4c346e7d89 am: 6d4d6152c2 am: 35e071c40b

Change-Id: I100cbb8375b64b2db9ecb1f7db3cd07944ee8e81

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