Implement all system menu title row buttons for Ash MD

ash/common/system/tiles/tiles_default_view.h

Index: ash/common/system/tiles/tiles_default_view.h
diff --git a/ash/common/system/tiles/tiles_default_view.h b/ash/common/system/tiles/tiles_default_view.h
index a6a308a419a92075b69ce44f30f9b8f8b982591b..9bc81c614f5964673db657c6a10cc96fc43dd117 100644
--- a/ash/common/system/tiles/tiles_default_view.h
+++ b/ash/common/system/tiles/tiles_default_view.h
@@ -5,13 +5,19 @@
 #ifndef ASH_COMMON_SYSTEM_TILES_TILES_DEFAULT_VIEW_H_
 #define ASH_COMMON_SYSTEM_TILES_TILES_DEFAULT_VIEW_H_
 
+#include "ash/common/login_status.h"
 #include "ash/common/system/chromeos/shutdown_policy_observer.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/view.h"
 
+namespace views {
+class CustomButton;
+}
+
 namespace ash {
+class SystemMenuButton;
 class SystemTrayItem;
 
 // The container view for the tiles in the bottom row of the system menu
@@ -20,7 +26,7 @@ class TilesDefaultView : public views::View,
                          public views::ButtonListener,
                          public ShutdownPolicyObserver {
  public:
-  explicit TilesDefaultView(SystemTrayItem* owner);
+  TilesDefaultView(SystemTrayItem* owner, LoginStatus login);
   ~TilesDefaultView() override;
 
   // Sets the layout manager and child views of |this|.
@@ -35,6 +41,8 @@ class TilesDefaultView : public views::View,
   void OnShutdownPolicyChanged(bool reboot_on_shutdown) override;
 
  private:
+  friend class TrayTilesTest;
+
   // Helper function to add a separator line between two tiles.
   // TODO(tdanderson|bruthig): Consider moving this to a location which can be
   // shared by other system menu rows.
@@ -42,13 +50,15 @@ class TilesDefaultView : public views::View,
 
   SystemTrayItem* owner_;
 
+  LoginStatus login_;
+
   // Pointers to the child buttons of |this|. Note that some buttons may not
   // exist (depending on the user's current login status, for instance), in
   // which case the corresponding pointer will be null.
-  views::Button* settings_button_;
-  views::Button* help_button_;
-  views::Button* lock_button_;
-  views::Button* power_button_;
+  views::CustomButton* settings_button_;
+  views::CustomButton* help_button_;
+  views::CustomButton* lock_button_;
+  views::CustomButton* power_button_;
 
   base::WeakPtrFactory<TilesDefaultView> weak_factory_;