Add PlatformWindow/Event related code for Ozone X11.

ui/events/platform/x11/x11_event_source_glib.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_EVENTS_PLATFORM_X11_X11_EVENT_SOURCE_GLIB_H_
+#define UI_EVENTS_PLATFORM_X11_X11_EVENT_SOURCE_GLIB_H_
+
+#include <stdint.h>
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/events/events_export.h"
+#include "ui/events/platform/x11/x11_event_source.h"
+#include "ui/gfx/x/x11_types.h"
+
+typedef struct _GPollFD GPollFD;
+typedef struct _GSource GSource;
+
+namespace ui {
+
+// A PlatformEventSource implementation for X11. Dispatches XEvents and uses
+// Glib to be notified for incoming XEvents.
+class EVENTS_EXPORT X11EventSourceGlib : public X11EventSource {
+ public:
+  explicit X11EventSourceGlib(XDisplay* display);
+  ~X11EventSourceGlib() override;
+
+  // PlatformEventSource:
+  uint32_t DispatchEvent(XEvent* xevent) override;
+
+ private:
+  void InitXSource(int fd);
+
+  // The GLib event source for X events.
+  GSource* x_source_ = nullptr;
+
+  // The poll attached to |x_source_|.
+  scoped_ptr<GPollFD> x_poll_;
+
+  DISALLOW_COPY_AND_ASSIGN(X11EventSourceGlib);
+};
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_PLATFORM_X11_X11_EVENT_SOURCE_GLIB_H_