Merge NetworkListViewBase hierarchy and NetworkStateListDetailedView

ash/system/tray/hover_highlight_view.h

Index: ash/system/tray/hover_highlight_view.h
diff --git a/ash/system/tray/hover_highlight_view.h b/ash/system/tray/hover_highlight_view.h
index a5831acf89b4fdc2c8091c4a0c16a2abc57a6ff9..41bd7a4896369f7b9bb397bc931fcda17f10649d 100644
--- a/ash/system/tray/hover_highlight_view.h
+++ b/ash/system/tray/hover_highlight_view.h
@@ -85,6 +85,8 @@ class HoverHighlightView : public ActionableView {
   // Removes current children of the view so that it can be re-populated.
   void Reset();
 
+  bool is_populated() const { return is_populated_; }
+
   views::Label* text_label() { return text_label_; }
   views::Label* sub_text_label() { return sub_text_label_; }