Split out ChildWindowWin

gpu/ipc/service/child_window_win.h

Index: gpu/ipc/service/child_window_win.h
diff --git a/gpu/ipc/service/child_window_win.h b/gpu/ipc/service/child_window_win.h
new file mode 100644
index 0000000000000000000000000000000000000000..2bccf9ff926e310c77fef88b795ab3b8811474f3
--- /dev/null
+++ b/gpu/ipc/service/child_window_win.h
@@ -0,0 +1,47 @@
+// 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;
+
+// The window DirectComposition renders into needs to be owned by the process
+// that's currently doing the rendering. The class creates and owns a window
+// which is reparented by the browser to be a child of its window.
+class ChildWindowWin {
+ 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_