Create a Tether section in the system tray network list.

chromeos/network/network_state_handler.cc

Index: chromeos/network/network_state_handler.cc
diff --git a/chromeos/network/network_state_handler.cc b/chromeos/network/network_state_handler.cc
index cb8e51d850e9130f4b0ab7af79679cd49738a885..8bfe0ae87d0909f4a8a60e0109fb5f87b5ae89dc 100644
--- a/chromeos/network/network_state_handler.cc
+++ b/chromeos/network/network_state_handler.cc
@@ -200,6 +200,10 @@ bool NetworkStateHandler::GetScanningByType(
 const NetworkState* NetworkStateHandler::GetNetworkState(
     const std::string& service_path) const {
   const NetworkState* network = GetModifiableNetworkState(service_path);
+  // This is a hack that I don't intend to keep here.

[Ryan Hansberry, 2017/02/15 19:57:39]

Could/should NetworkListMd be changed to use NetworkState's guids instead of
their paths?

[stevenjb, 2017/02/15 20:59:04]

We shouldn't do this hack. Ideally converting NetworkListMd to use guid for
everything would be great, but for TETHER networks it will need to call
GetNetworkStateFromGuid directly regardless.

[Ryan Hansberry, 2017/02/16 22:42:20]

Fixed after https://codereview.chromium.org/2698473007/

+  if (!network) {
+    return GetNetworkStateFromGuid(service_path);
+  }
   if (network && !network->update_received())
     return nullptr;
   return network;
@@ -289,6 +293,16 @@ void NetworkStateHandler::GetNetworkListByType(const NetworkTypePattern& type,
   DCHECK(list);
   list->clear();
   int count = 0;
+
+  if (NetworkTypePattern::Tether().MatchesPattern(type)) {
+    for (auto iter = tether_network_list_.begin();
+        iter != tether_network_list_.end(); ++iter) {
+      list->push_back((*iter)->AsNetworkState());
+      if (limit > 0 && ++count >= limit)
+        return;
+    }
+  }
+
   // Sort the network list if necessary.
   if (!network_list_sorted_)
     SortNetworkList();