linux_aura: Implement the static part of the dbus menu for Unity.

chrome/browser/ui/views/frame/global_menu_bar_registrar_x11.h

+// Copyright 2013 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 CHROME_BROWSER_UI_VIEWS_FRAME_GLOBAL_MENU_BAR_REGISTRAR_X11_H_
+#define CHROME_BROWSER_UI_VIEWS_FRAME_GLOBAL_MENU_BAR_REGISTRAR_X11_H_
+
+#include <gio/gio.h>
+
+#include <set>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/singleton.h"
+#include "ui/base/glib/glib_signal.h"
+
+// Advertises our menu bars to Unity.
+//
+// GlobalMenuBarX11 is responsible for managing the DbusmenuServer for each
+// XID. We need a separate object to own the dbus channel to
+// com.canonical.AppMenu.Registrar and to register/unregister the mapping
+// between a XID and the DbusmenuServer instance we are offering.
+class GlobalMenuBarRegistrarX11 {
+ public:
+  static GlobalMenuBarRegistrarX11* GetInstance();
+
+  void OnWindowMapped(unsigned long xid);
+  void OnWindowUnmapped(unsigned long xid);
+
+ private:
+  friend struct DefaultSingletonTraits<GlobalMenuBarRegistrarX11>;
+
+  GlobalMenuBarRegistrarX11();
+  ~GlobalMenuBarRegistrarX11();
+
+  // Sends the actual message.
+  void RegisterXID(unsigned long xid);
+  void UnregisterXID(unsigned long xid);
+
+  CHROMEG_CALLBACK_1(GlobalMenuBarRegistrarX11, void, OnProxyCreated,
+                     GObject*, GAsyncResult*);
+  CHROMEG_CALLBACK_1(GlobalMenuBarRegistrarX11, void, OnNameOwnerChanged,
+                     GObject*, GParamSpec*);
+
+  GDBusProxy* registrar_proxy_;
+
+  // Window XIDs which want to be registered, but haven't yet been because
+  // we're waiting for the proxy to become available.
+  std::set<unsigned long> live_xids_;
+
+  DISALLOW_COPY_AND_ASSIGN(GlobalMenuBarRegistrarX11);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_FRAME_GLOBAL_MENU_BAR_REGISTRAR_X11_H_