Add PlatformWindow/Event related code for Ozone X11.

ui/ozone/platform/x11/x11_window_manager_ozone.h

+// Copyright 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 UI_OZONE_PLATFORM_X11_X11_WINDOW_MANAGER_OZONE_H_
+#define UI_OZONE_PLATFORM_X11_X11_WINDOW_MANAGER_OZONE_H_
+
+#include <map>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+
+typedef unsigned long XID;
+
+namespace ui {
+
+class PlatformWindowDelegate;
+class X11WindowOzone;
+using WindowStatusCallback = base::Callback<void(XID, X11WindowOzone*)>;
+
+// Manages X11WindowOzones and holds map from XID to X11WindowOzone.
+class X11WindowManagerOzone : public base::RefCounted<X11WindowManagerOzone> {

[sadrul, 2016/01/21 14:53:01]

Why does this need to be refcounted?

[kylechar, 2016/01/26 15:24:25]

For the callbacks. I think X11WindowManagerOzone should live longer than any
X11WindowOzone instances so it's probably safe to not have it ref counted. I've
changed that.

+ public:
+  X11WindowManagerOzone();
+
+  // Creates a new X11WindowOzone.
+  scoped_ptr<X11WindowOzone> CreatePlatformWindow(
+      PlatformWindowDelegate* delegate);
+
+  // Returns the window that corresponds to the XID or nullptr if not found.
+  X11WindowOzone* FindWindow(XID id);
+
+ private:
+  friend class base::RefCounted<X11WindowManagerOzone>;
+  virtual ~X11WindowManagerOzone();
+
+  void OnWindowCreate(XID id, X11WindowOzone* window);
+  void OnWindowDestroy(XID id, X11WindowOzone* window);
+
+  std::map<XID, X11WindowOzone*> window_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(X11WindowManagerOzone);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_X11_X11_WINDOW_MANAGER_OZONE_H_