Add unittest for ArcNotificationContentView

ui/arc/notification/arc_notification_surface_manager_impl.h

Index: ui/arc/notification/arc_notification_surface_manager_impl.h
diff --git a/ui/arc/notification/arc_notification_surface_manager_impl.h b/ui/arc/notification/arc_notification_surface_manager_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..eecf76268361d51922ed9ab96bcb23d9adbb959e
--- /dev/null
+++ b/ui/arc/notification/arc_notification_surface_manager_impl.h
@@ -0,0 +1,53 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_ARC_NOTIFICATION_ARC_NOTIFICATION_SURFACE_MANAGER_IMPL_H_
+#define UI_ARC_NOTIFICATION_ARC_NOTIFICATION_SURFACE_MANAGER_IMPL_H_
+
+#include <map>
+#include <string>
+
+#include "base/macros.h"
+#include "base/observer_list.h"
+#include "components/exo/notification_surface_manager.h"
+#include "ui/arc/notification/arc_notification_surface_manager.h"
+
+namespace arc {
+
+class ArcNotificationSurface;
+class ArcNotificationSurfaceImpl;
+
+class ArcNotificationSurfaceManagerImpl
+    : public ArcNotificationSurfaceManager,
+      public exo::NotificationSurfaceManager {
+ public:
+  ArcNotificationSurfaceManagerImpl();
+  ~ArcNotificationSurfaceManagerImpl() override;
+
+  // ArcNotificationSurfaceManager:
+  ArcNotificationSurface* GetArcSurface(
+      const std::string& notification_id) const override;
+  void AddObserver(Observer* observer) override;
+  void RemoveObserver(Observer* observer) override;
+
+  // exo::NotificationSurfaceManager:
+  exo::NotificationSurface* GetSurface(
+      const std::string& notification_id) const override;
+  void AddSurface(exo::NotificationSurface* surface) override;
+  void RemoveSurface(exo::NotificationSurface* surface) override;
+
+ private:
+  using NotificationSurfaceMap =
+      std::unordered_map<std::string,
+                         std::unique_ptr<ArcNotificationSurfaceImpl>>;
+  NotificationSurfaceMap notification_surface_map_;
+
+  base::ObserverList<Observer> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcNotificationSurfaceManagerImpl);
+};
+
+}  // namespace arc
+
+#endif  // UI_ARC_NOTIFICATION_ARC_NOTIFICATION_SURFACE_MANAGER_IMPL_H_