[automerger skipped] Seq header shouldn't change in the middle of frame am: 53285a00de am: f6f2c8dd76 -s ours am: 725a72f4ff -s ours am: 19ce948fed -s ours am: 151299aacf -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: I0cf34c96f66e8566b8360d81170d0281cc735872