Split out ChildWindowWin

gpu/ipc/service/child_window_win.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 GPU_IPC_SERVICE_CHILD_WINDOW_WIN_H_
+#define GPU_IPC_SERVICE_CHILD_WINDOW_WIN_H_
+
+#include "base/memory/weak_ptr.h"
+#include "gpu/ipc/service/image_transport_surface_delegate.h"
+
+#include <windows.h>
+
+namespace gpu {
+
+struct SharedData;
+
+class ChildWindowWin {

[stanisc, 2017/01/10 20:54:57]

Consider adding a short comment that explaining the class purpose.

+ public:
+  ChildWindowWin(base::WeakPtr<ImageTransportSurfaceDelegate> delegate,
+                 HWND parent_window);
+  ~ChildWindowWin();
+
+  bool Initialize();
+  void ClearInvalidContents();
+  HWND window() const { return window_; }
+
+ private:
+  // This member contains all the data that can be accessed from the main or
+  // window owner threads.
+  std::unique_ptr<SharedData> shared_data_;
+  // The eventual parent of the window living in the browser process.
+  HWND parent_window_;
+  HWND window_;
+  // The window is initially created with this parent window. We need to keep it
+  // around so that we can destroy it at the end.
+  HWND initial_parent_window_;
+  base::WeakPtr<ImageTransportSurfaceDelegate> delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChildWindowWin);
+};
+
+}  // namespace gpu
+
+#endif  // GPU_IPC_SERVICE_CHILD_WINDOW_WIN_H_