Add known issue about confusing log. am: c21ce02da1 am: 08c96cc64d am: a28bc8052a am: f4ba828bf6
Add known issue about confusing log. am: c21ce02da1 am: 08c96cc64d am: a28bc8052a am: f4ba828bf6

Original change: https://android-review.googlesource.com/c/platform/external/perfetto/+/1567366

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Iaef95fed076ec79af111b083a1d11f50c9e7f672

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