Add new WifiWake metrics

    // Start time of session in milliseconds.

    optional int64 start_time_millis = 1;

    // The number of networks the lock was initialized with at start.

    // The number of networks the lock was provided with at start.

    optional int32 locked_networks_at_start = 2;

    // The number of networks in the lock at the time of the initialize event. Only valid if

    // initialize_event is recorded.

    optional int32 locked_networks_at_initialize = 6;

    // Event for fully initializing the WakeupLock (i.e. WakeupLock is "locked").

    optional Event initialize_event = 7;

    // Event for unlocking the WakeupLock. Does not occur if lock was initialized with 0 networks.

    optional Event unlock_event = 3;

  // Session information for every Wifi Wake session (up to a maximum of 10).

  repeated Session sessions = 2;

  // Number of ignored calls to start (due to WakeupController already being active).

  optional int32 num_ignored_starts = 3;

  // Number of Wifi Wake sessions that have recorded wakeup events.

  optional int32 num_wakeups = 4;

}