[headless] AddWindowTreeClient

headless/lib/browser/headless_window_tree_client.h

Index: headless/lib/browser/headless_window_tree_client.h
diff --git a/headless/lib/browser/headless_window_tree_client.h b/headless/lib/browser/headless_window_tree_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..c64e3daf92b830e2f681d67fcedd3654f423fe60
--- /dev/null
+++ b/headless/lib/browser/headless_window_tree_client.h
@@ -0,0 +1,30 @@
+// Copyright (c) 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 HEADLESS_LIB_BROWSER_HEADLESS_WINDOW_TREE_CLIENT_H_
+#define HEADLESS_LIB_BROWSER_HEADLESS_WINDOW_TREE_CLIENT_H_
+
+#include "base/macros.h"
+#include "ui/aura/client/window_tree_client.h"
+
+namespace headless {
+
+class HeadlessWindowTreeClient : public aura::client::WindowTreeClient {
+ public:
+  explicit HeadlessWindowTreeClient(aura::Window* root_window);
+  ~HeadlessWindowTreeClient() override;
+
+  aura::Window* GetDefaultParent(aura::Window* context,
+                                 aura::Window* window,
+                                 const gfx::Rect& bounds) override;
+
+ private:
+  aura::Window* root_window_;  // Not owned.
+
+  DISALLOW_COPY_AND_ASSIGN(HeadlessWindowTreeClient);
+};
+
+}  // namespace headless
+
+#endif  // HEADLESS_LIB_BROWSER_HEADLESS_WINDOW_TREE_CLIENT_H_