Add unittests of ArcCustomNotificationView

components/exo/notification_surface_impl.h

Index: components/exo/notification_surface_impl.h
diff --git a/components/exo/notification_surface_impl.h b/components/exo/notification_surface_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..1aee0287bae0f01db1436739f3b0b5dcac28310d
--- /dev/null
+++ b/components/exo/notification_surface_impl.h
@@ -0,0 +1,61 @@
+// 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 COMPONENTS_EXO_NOTIFICATION_SURFACE_IMPL_H_
+#define COMPONENTS_EXO_NOTIFICATION_SURFACE_IMPL_H_
+
+#include <memory>
+#include <string>
+
+#include "base/macros.h"
+#include "components/exo/notification_surface.h"
+#include "components/exo/surface_delegate.h"
+#include "components/exo/surface_observer.h"
+#include "ui/gfx/geometry/size.h"
+
+namespace aura {
+class Window;
+}
+
+namespace exo {
+class NotificationSurfaceManager;
+class Surface;
+
+// Handles notification surface role of a given surface.
+class NotificationSurfaceImpl : public NotificationSurface,
+                                public SurfaceDelegate,
+                                public SurfaceObserver {
+ public:
+  NotificationSurfaceImpl(NotificationSurfaceManager* manager,
+                          Surface* surface,
+                          const std::string& notification_id);
+  ~NotificationSurfaceImpl() override;
+
+  gfx::Size GetSize() const override;
+  void AttachWindow(views::NativeViewHost* nvh) override;
+
+  aura::Window* GetWindow() const override;
+  const std::string& GetNotificationId() const override;
+
+  // Overridden from SurfaceDelegate:
+  void OnSurfaceCommit() override;
+  bool IsSurfaceSynchronized() const override;
+
+  // Overridden from SurfaceObserver:
+  void OnSurfaceDestroying(Surface* surface) override;
+
+ private:
+  NotificationSurfaceManager* const manager_;  // Not owned.
+  Surface* surface_;                           // Not owned.
+  const std::string notification_id_;
+
+  std::unique_ptr<aura::Window> window_;
+  bool added_to_manager_ = false;
+
+  DISALLOW_COPY_AND_ASSIGN(NotificationSurfaceImpl);
+};
+
+}  // namespace exo
+
+#endif  // COMPONENTS_EXO_NOTIFICATION_SURFACE_IMPL_H_