[automerger skipped] Merge "Add keepalive related methods and fields to system APIs" am: 434bc5adf4 am: 57e9fd7e5a am: 6e6fd92d08 -s ours
am skip reason: Change-Id I2d982e8abb5cb6b4c74a20483550b18cf814320d with SHA-1 5a916810c6 is in history
Change-Id: Iac4c0a4c7d56693fe3505336c007565ac3ce76f8
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