Reland r126700: ash uber tray: Add the detailed network popup

ash/system/network/tray_network.h

Index: ash/system/network/tray_network.h
diff --git a/ash/system/network/tray_network.h b/ash/system/network/tray_network.h
index ff5fae89ae479c1fc678e4dd341f2b9eb6df344b..d50f7fb00968da10884bd9a44b7487cd11e0d465 100644
--- a/ash/system/network/tray_network.h
+++ b/ash/system/network/tray_network.h
@@ -15,6 +15,7 @@ namespace internal {
 
 namespace tray {
 class NetworkDefaultView;
+class NetworkDetailedView;
 class NetworkTrayView;
 }
 
@@ -38,6 +39,7 @@ class TrayNetwork : public SystemTrayItem,
 
   scoped_ptr<tray::NetworkTrayView> tray_;
   scoped_ptr<tray::NetworkDefaultView> default_;
+  scoped_ptr<tray::NetworkDetailedView> detailed_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayNetwork);
 };