wifi.proto: Add fields for network selection metrics collection

  // Link Probe metrics

  optional LinkProbeStats link_probe_stats = 139;

  // List of NetworkSelectionExperimentDecisions stats for each experiment

  repeated NetworkSelectionExperimentDecisions network_selection_experiment_decisions_list = 140;

}

// Information that gets logged for every WiFi connection.

  // Counts the occurrences of error codes for failed link probes.

  repeated LinkProbeFailureReasonCount failure_reason_counts = 8;

}

// Stores the decisions that were made by a experiment when compared against another experiment

message NetworkSelectionExperimentDecisions {

  // the id of one experiment

  optional int32 experiment1_id = 1;

  // the id of the other experiment

  optional int32 experiment2_id = 2;

  // Counts occurrences of the number of network choices there were when experiment1 makes the

  // same network selection as experiment2.

  // The keys are the number of network choices, and the values are the number of occurrences of

  // this number of network choices when exp1 and exp2 make the same network selection.

  repeated MapEntryInt32Int32 same_selection_num_choices_counter = 3;

  // Counts occurrences of the number of network choices there were when experiment1 makes the

  // same network selection as experiment2.

  // The keys are the number of network choices, and the values are the number of occurrences of

  // this number of network choices when exp1 and exp2 make different network selections.

  // Note that it is possible for the network selection to be different even when there only exists

  // a single network choice, since choosing not to connect to that network is a valid choice.

  repeated MapEntryInt32Int32 different_selection_num_choices_counter = 4;

}