[Chromecast] Reuse the Aura window manager across receiver apps.

chromecast/graphics/cast_window_manager_default.h

+// 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 CHROMECAST_GRAPHICS_CAST_WINDOW_MANAGER_DEFAULT_H_
+#define CHROMECAST_GRAPHICS_CAST_WINDOW_MANAGER_DEFAULT_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "chromecast/graphics/cast_window_manager.h"
+
+namespace chromecast {
+
+class CastWindowManagerDefault : public CastWindowManager {
+ public:
+  ~CastWindowManagerDefault() override;
+
+  // CastWindowManager implementation:
+  void TearDown() override;
+  void AddWindow(gfx::NativeView window) override;
+
+ private:
+  friend class CastWindowManager;
+
+  // This class should only be instantiated by CastWindowManager::Create.
+  CastWindowManagerDefault();
+
+  DISALLOW_COPY_AND_ASSIGN(CastWindowManagerDefault);
+};
+
+}  // namespace chromecast
+
+#endif  // CHROMECAST_GRAPHICS_CAST_WINDOW_MANAGER_DEFAULT_H_