Add a row in the network tray to inform users to turn Bluetooth on to enable Tether.

ash/system/network/network_list.cc

Index: ash/system/network/network_list.cc
diff --git a/ash/system/network/network_list.cc b/ash/system/network/network_list.cc
index 9ed47151bdadd73493461f693f89e7b1972e9aa5..f4ae466a2d55cf850a98d2d9b1fa52e56082e373 100644
--- a/ash/system/network/network_list.cc
+++ b/ash/system/network/network_list.cc
@@ -641,13 +641,19 @@ void NetworkListView::UpdateInfoLabel(int message_id,
     return;
   }
   if (!info_label)
-    info_label = new InfoLabel(message_id);
+    info_label = new InfoLabel(message_id, this);

[Kyle Horimoto, 2017/07/10 18:37:07]

/* delegate */

[lesliewatkins, 2017/07/12 21:49:50]

Done.

   else
-    info_label->SetMessage(message_id);
+    info_label->Update(message_id);
+
   PlaceViewAtIndex(info_label, insertion_index);
   *info_label_ptr = info_label;
 }
 
+void NetworkListView::OnLabelClicked(TrayDetailsView::InfoLabel* label) {
+  if (label->message_id() == IDS_ASH_STATUS_TRAY_ENABLE_BLUETOOTH)
+    Shell::Get()->system_tray_controller()->ShowBluetoothSettings();
+}
+
 int NetworkListView::UpdateSectionHeaderRow(NetworkTypePattern pattern,
                                             bool enabled,
                                             int child_index,