Add unittest for ArcNotificationContentView

ui/arc/notification/arc_notification_surface_impl.h

Index: ui/arc/notification/arc_notification_surface_impl.h
diff --git a/ui/arc/notification/arc_notification_surface_impl.h b/ui/arc/notification/arc_notification_surface_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..c4a50720c5801f29eb8b118adfaa532c55b9f068
--- /dev/null
+++ b/ui/arc/notification/arc_notification_surface_impl.h
@@ -0,0 +1,41 @@
+// 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_IMPL_H_
+#define UI_ARC_NOTIFICATION_ARC_NOTIFICATION_SURFACE_IMPL_H_
+
+#include "ui/arc/notification/arc_notification_surface.h"
+
+namespace exo {
+class NotificationSurface;
+}
+
+namespace arc {
+
+// Handles notification surface role of a given surface.
+class ArcNotificationSurfaceImpl : public ArcNotificationSurface {
+ public:
+  explicit ArcNotificationSurfaceImpl(exo::NotificationSurface* surface);
+
+  // ArcNotificationSurface overrides:
+  gfx::Size GetSize() const override;
+  aura::Window* GetWindow() const override;
+  aura::Window* GetContentWindow() const override;
+  const std::string& GetNotificationKey() const override;
+  void Attach(views::NativeViewHost* native_view_host) override;
+  void Detach() override;
+  bool IsAttached() const override;
+
+  exo::NotificationSurface* surface() const { return surface_; }
+
+ private:
+  exo::NotificationSurface* surface_;
+  views::NativeViewHost* native_view_host_ = nullptr;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcNotificationSurfaceImpl);
+};
+
+}  // namespace arc
+
+#endif  // UI_ARC_NOTIFICATION_ARC_NOTIFICATION_SURFACE_IMPL_H_