Add ash UI for third-party VPNs

ui/chromeos/network/network_list_delegate.h

Index: ui/chromeos/network/network_list_delegate.h
diff --git a/ui/chromeos/network/network_list_delegate.h b/ui/chromeos/network/network_list_delegate.h
index 97883b8d6e5004ee969f5f5912c805a1607e57de..abdf3ad395fd95039cbfbfb13704588a876d3fd0 100644
--- a/ui/chromeos/network/network_list_delegate.h
+++ b/ui/chromeos/network/network_list_delegate.h
@@ -44,6 +44,9 @@ class UI_CHROMEOS_EXPORT NetworkListDelegate {
   // (e.g. unavailability of network etc.).
   virtual views::Label* CreateInfoLabel() = 0;
 
+  // Called when the user clicks on an entry representing a network in the list.
+  virtual void OnViewClicked(views::View* sender) = 0;
+
   virtual void RelayoutScrollList() = 0;
 };