Add BusConnection::gconnection() function.

src/common/chromeos/dbus/dbus.h

 // Copyright (c) 2009 The Chromium OS 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 CHROMEOS_DBUS_H_
 #define CHROMEOS_DBUS_H_
 
 #include <dbus/dbus-glib.h>
 #include <glib-object.h>
 
@@ skipping 28 matching lines @@
 
   ~BusConnection() {
     ::dbus_g_connection_unref(object_);
   }
 
   BusConnection& operator=(BusConnection x) {
     swap(*this, x);
     return *this;
   }
 
+  const value_type& g_connection() const {
+    DCHECK(object_) << "referencing an empty connection";
+    return object_;
+  }
+
  private:
   friend void swap(BusConnection& x, BusConnection& y);
 
   friend class Proxy;
   friend BusConnection GetSystemBusConnection();
   friend BusConnection GetPrivateBusConnection(const char* address);
 
   // Constructor takes ownership
   explicit BusConnection(::DBusGConnection* x)
       : object_(x) {
@@ skipping 258 matching lines @@
 BusConnection GetSystemBusConnection();
 
 // \brief Returns a private connection to a bus at |address|.
 
 BusConnection GetPrivateBusConnection(const char* address);
 
 }  // namespace dbus
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_H_