platform-window: Add a PlatformWindowFactory for creating windows.

ui/platform_window/x11/x11_window_factory.h

+// Copyright 2014 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 UI_PLATFORM_WINDOW_X11_X11_WINDOW_FACTORY_H_
+#define UI_PLATFORM_WINDOW_X11_X11_WINDOW_FACTORY_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/platform_window/platform_window_factory.h"
+#include "ui/platform_window/x11/x11_window_export.h"
+
+namespace ui {
+
+class PlatformEventSource;
+
+class X11_WINDOW_EXPORT X11WindowFactory : public PlatformWindowFactory {
+ public:
+  static PlatformWindowFactory* CreateIfNecessary();
+
+ private:
+  X11WindowFactory();
+  virtual ~X11WindowFactory();
+
+  // PlatformWindowFactory:
+  virtual scoped_ptr<PlatformWindow> CreatePlatformWindow(
+      PlatformWindowDelegate* delegate,
+      const gfx::Rect& bounds) OVERRIDE;
+
+  scoped_ptr<PlatformEventSource> event_source_;
+
+  DISALLOW_COPY_AND_ASSIGN(X11WindowFactory);
+};
+
+}  // namespace ui
+
+#endif  // UI_PLATFORM_WINDOW_X11_X11_WINDOW_FACTORY_H_