[automerger skipped] Seq header shouldn't change in the middle of frame am: 53285a00de am: f6f2c8dd76 -s ours

am skip reason: Change-Id Ibdc62e7092685357b0246b68f523e5296d13e5bd with SHA-1 74ce948e6d is in history

Original change: https://android-review.googlesource.com/c/platform/external/libaom/+/1371372

Change-Id: Ia886241c786fd60f65cac124d16f671515a05423