Add unittests of ArcCustomNotificationView

ui/arc/notification/arc_custom_notification_view.h

Index: ui/arc/notification/arc_custom_notification_view.h
diff --git a/ui/arc/notification/arc_custom_notification_view.h b/ui/arc/notification/arc_custom_notification_view.h
index 41c5347ac83324835fc99e089db0dd49cc0f7e97..8ee10ea4a61f0cd331b90e13154d3e9782170f82 100644
--- a/ui/arc/notification/arc_custom_notification_view.h
+++ b/ui/arc/notification/arc_custom_notification_view.h
@@ -9,7 +9,7 @@
 #include <string>
 
 #include "base/macros.h"
-#include "ui/arc/notification/arc_custom_notification_item.h"
+#include "ui/arc/notification/arc_notification_item.h"
 #include "ui/arc/notification/arc_notification_surface_manager.h"
 #include "ui/aura/window_observer.h"
 #include "ui/message_center/views/custom_notification_content_view_delegate.h"
@@ -32,16 +32,23 @@ class ArcCustomNotificationView
     : public views::NativeViewHost,
       public views::ButtonListener,
       public aura::WindowObserver,
-      public ArcCustomNotificationItem::Observer,
+      public ArcNotificationItem::Observer,
       public ArcNotificationSurfaceManager::Observer {
  public:
-  explicit ArcCustomNotificationView(ArcCustomNotificationItem* item);
+  static const char kViewClassName[];

[hidehiko, 2017/03/02 15:38:16]

Could you add brief comment what this is for?

+
+  explicit ArcCustomNotificationView(ArcNotificationItem* item);
   ~ArcCustomNotificationView() override;
 
+  // views::View overrides:
+  const char* GetClassName() const override;
+
   std::unique_ptr<message_center::CustomNotificationContentViewDelegate>
   CreateContentViewDelegate();
 
  private:
+  friend class ArcCustomNotificationViewTest;
+
   class ContentViewDelegate;
   class ControlButton;
   class EventForwarder;
@@ -86,7 +93,7 @@ class ArcCustomNotificationView
   void OnNotificationSurfaceAdded(exo::NotificationSurface* surface) override;
   void OnNotificationSurfaceRemoved(exo::NotificationSurface* surface) override;
 
-  ArcCustomNotificationItem* item_ = nullptr;
+  ArcNotificationItem* item_ = nullptr;
   exo::NotificationSurface* surface_ = nullptr;
 
   const std::string notification_key_;