automerge: 0b039b0
* commit '0b039b031557d77e112e88925904e9668f764aa7':
camera-metadata: clarify the AE precapture trigger spec
automerge: 0b039b0
* commit '0b039b031557d77e112e88925904e9668f764aa7':
camera-metadata: clarify the AE precapture trigger spec