[automerger] Decoder: Set prev slice type for I slice. am: aecdfd1aff am: 65db3cc9a3 am: 93e93983e1 am: 0f9ee33f0a am: 9d76581d46 am: 475e185a91 am: 16d1d4faa8 am: 08e373f4fe am: aa395054d5 am: 3c729938cc am: c901efd3fd am: ab81339c93
am: 28d8a7e421

Change-Id: I065ea9b71423ac7ecc6155e3a721c3a793dab42e