Add unittest for ArcNotificationContentView

ui/arc/notification/arc_notification_surface.h

Index: ui/arc/notification/arc_notification_surface.h
diff --git a/ui/arc/notification/arc_notification_surface.h b/ui/arc/notification/arc_notification_surface.h
new file mode 100644
index 0000000000000000000000000000000000000000..02379a8cfc1acc6520de66058cbb4ddc24a1a958
--- /dev/null
+++ b/ui/arc/notification/arc_notification_surface.h
@@ -0,0 +1,57 @@
+// 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_H_
+#define UI_ARC_NOTIFICATION_ARC_NOTIFICATION_SURFACE_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "ui/gfx/geometry/size.h"
+
+namespace aura {
+class Window;
+}
+
+namespace views {
+class NativeViewHost;
+}
+
+namespace arc {
+
+// Handles notification surface role.
+class ArcNotificationSurface {
+ public:
+  ArcNotificationSurface() = default;
+  virtual ~ArcNotificationSurface() = default;
+
+  // Returns the content size of the notification surface.
+  virtual gfx::Size GetSize() const = 0;
+
+  // Returns the window of NotificationSurface.
+  virtual aura::Window* GetWindow() const = 0;
+
+  // Returns the window of the inner Surface.
+  virtual aura::Window* GetContentWindow() const = 0;
+
+  // Returns the notification key which is associated with Android notification.
+  virtual const std::string& GetNotificationKey() const = 0;
+
+  // Attaches the surface window to the native host.
+  virtual void Attach(views::NativeViewHost* native_view_host) = 0;
+
+  // Detaches the surface window from the native host. Please ensure that a
+  // surface window is attached before calling this method.
+  virtual void Detach() = 0;
+
+  // True if the surface window is attached to the native host. False otherwise.
+  virtual bool IsAttached() const = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ArcNotificationSurface);
+};
+
+}  // namespace arc
+
+#endif  // UI_ARC_NOTIFICATION_ARC_NOTIFICATION_SURFACE_H_