network_health: add guid field to network mojo struct

This optional GUID is populated with the underlying
NetworkStateProperties GUID field. If the Device does not have an
associated network, the field will be empty.

Bug: chromium:1085092
Change-Id: I5531022b887a9136a80c2f37d9398b3df663d3b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2247146
Commit-Queue: Trent Begin <tbegin@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779366}

chrome/browser/chromeos/net/network_health/network_health.cc

@@ -68,6 +68,7 @@ mojom::NetworkPtr CreateNetwork(
   if (net_prop) {
     net->state = ConnectionStateToNetworkState(net_prop->connection_state);
     net->name = net_prop->name;
+    net->guid = net_prop->guid;
   } else {
     net->state = DeviceStateToNetworkState(device_prop->device_state);
   }

chromeos/services/network_health/public/mojom/network_health.mojom

@@ -34,9 +34,10 @@ enum NetworkState {
 // Contains information for a single network connection and underlying
 // network technology e.g WiFi.
 struct Network {
-
   chromeos.network_config.mojom.NetworkType type;
   NetworkState state;
+  // The unique identifier for the network when a network service exists.
+  string? guid;
   // The user facing name of the network if available.
   string? name;
   // Optional string for the network's mac_address.