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

chromecast/graphics/cast_window_manager.h

+// Copyright 2016 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_

[alokp, 2017/01/17 23:08:17]

nit: The name of this directory is now wrong. We should rename this directory to
ui/. It can be done in a separate patch.

[Joshua LeVasseur, 2017/01/18 00:55:38]

Acknowledged.

+#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() {}
+
+  // Allocate the graphics resources and show.
+  // Can be called multiple times, including after TearDown().
+  virtual void Setup() = 0;
+
+  // Remove all windows and release all graphics resources.
+  // Can be called multiple times.
+  virtual void TearDown() = 0;
+
+  // Adds a window to the window manager and shows the window.
+  virtual void AddAndShowWindow(gfx::NativeView window) = 0;

[halliwell, 2017/01/18 00:50:40]

why does this warrant a separate interface entry?  Is there any scenario where
this wouldn't just be AddWindow followed by Show on the window?

[Joshua LeVasseur, 2017/01/18 00:55:38]

I was just keeping the flow similar to what was there before.  It currently is
unnecessary to have this interface.

+
+  // Adds a window to the window manager without adjusting the window's
+  // visibility.
+  virtual void AddWindow(gfx::NativeView window) = 0;
+};
+
+}  // namespace chromecast
+
+#endif  // CHROMECAST_GRAPHICS_CAST_WINDOW_MANAGER_H_