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

chromecast/graphics/cast_window_manager.h

Index: chromecast/graphics/cast_window_manager.h
diff --git a/chromecast/graphics/cast_window_manager.h b/chromecast/graphics/cast_window_manager.h
new file mode 100644
index 0000000000000000000000000000000000000000..bf2dc4b63f3a292c79bd76465b361db176441208
--- /dev/null
+++ b/chromecast/graphics/cast_window_manager.h
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+// 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_H_
+#define CHROMECAST_GRAPHICS_CAST_WINDOW_MANAGER_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace chromecast {
+
+// Chromecast's window-manager interface.
+// This declares the interface to add top-level windows to the Chromecast
+// platform window.  It is owned by the UI thread, and generally one instance
+// should exist per platform root window (e.g., in Ozone, one per Ozone window).
+class CastWindowManager {
+ public:
+  // Creates the platform-specific CastWindowManager.
+  static std::unique_ptr<CastWindowManager> Create(bool enable_input);
+
+  virtual ~CastWindowManager() {}
+
+  // Remove all windows and release all graphics resources.
+  // Can be called multiple times.
+  virtual void TearDown() = 0;
+
+  // Adds a window to the window manager.
+  // This doesn't necessarily make the window visible.
+  // If the window manager hasn't been initialized, this has the side effect of
+  // causing it to initialize.
+  virtual void AddWindow(gfx::NativeView window) = 0;
+};
+
+}  // namespace chromecast
+
+#endif  // CHROMECAST_GRAPHICS_CAST_WINDOW_MANAGER_H_