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

ash/system/tray/system_tray.cc

Index: ash/system/tray/system_tray.cc
diff --git a/ash/system/tray/system_tray.cc b/ash/system/tray/system_tray.cc
index 32d4a4ec81c500241c475d6f20a8581c4cf6417b..3629a206cfe1f48aa1805b8c277ef675910465a0 100644
--- a/ash/system/tray/system_tray.cc
+++ b/ash/system/tray/system_tray.cc
@@ -280,6 +280,12 @@ class SystemTrayBubble : public views::BubbleDelegateView {
 
 }  // namespace internal
 
+NetworkIconInfo::NetworkIconInfo() {
+}
+
+NetworkIconInfo::~NetworkIconInfo() {
+}
+
 SystemTray::SystemTray()
     : items_(),
       bubble_(NULL),
@@ -321,6 +327,17 @@ void SystemTray::RemoveTrayItem(SystemTrayItem* item) {
   NOTIMPLEMENTED();
 }
 
+void SystemTray::ShowDefaultView() {
+  if (popup_) {
+    popup_->RemoveObserver(this);
+    popup_->Close();
+  }
+  popup_ = NULL;
+  bubble_ = NULL;
+
+  ShowItems(items_, false, true);
+}
+
 void SystemTray::ShowDetailedView(SystemTrayItem* item,
                                   int close_delay,
                                   bool activate) {