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diff --git a/chromium/third_party/webrtc/base/dbus.h b/chromium/third_party/webrtc/base/dbus.h
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+/*
+ *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_BASE_DBUS_H_
+#define WEBRTC_BASE_DBUS_H_
+
+#ifdef HAVE_DBUS_GLIB
+
+#include <dbus/dbus.h>
+
+#include <string>
+#include <vector>
+
+#include "webrtc/base/libdbusglibsymboltable.h"
+#include "webrtc/base/messagehandler.h"
+#include "webrtc/base/thread.h"
+
+namespace rtc {
+
+#define DBUS_TYPE                   "type"
+#define DBUS_SIGNAL                 "signal"
+#define DBUS_PATH                   "path"
+#define DBUS_INTERFACE              "interface"
+#define DBUS_MEMBER                 "member"
+
+#ifdef CHROMEOS
+#define CROS_PM_PATH                "/"
+#define CROS_PM_INTERFACE           "org.chromium.PowerManager"
+#define CROS_SIG_POWERCHANGED       "PowerStateChanged"
+#define CROS_VALUE_SLEEP            "mem"
+#define CROS_VALUE_RESUME           "on"
+#else
+#define UP_PATH                     "/org/freedesktop/UPower"
+#define UP_INTERFACE                "org.freedesktop.UPower"
+#define UP_SIG_SLEEPING             "Sleeping"
+#define UP_SIG_RESUMING             "Resuming"
+#endif  // CHROMEOS
+
+// Wraps a DBus messages.
+class DBusSigMessageData : public TypedMessageData<DBusMessage *> {
+ public:
+  explicit DBusSigMessageData(DBusMessage *message);
+  ~DBusSigMessageData();
+};
+
+// DBusSigFilter is an abstract class that defines the interface of DBus
+// signal handling.
+// The subclasses implement ProcessSignal() for various purposes.
+// When a DBus signal comes, a DSM_SIGNAL message is posted to the caller thread
+// which will then invokes ProcessSignal().
+class DBusSigFilter : protected MessageHandler {
+ public:
+  enum DBusSigMessage { DSM_SIGNAL };
+
+  // This filter string should ususally come from BuildFilterString()
+  explicit DBusSigFilter(const std::string &filter)
+      : caller_thread_(Thread::Current()), filter_(filter) {
+  }
+
+  // Builds a DBus monitor filter string from given DBus path, interface, and
+  // member.
+  // See http://dbus.freedesktop.org/doc/api/html/group__DBusConnection.html
+  static std::string BuildFilterString(const std::string &path,
+                                       const std::string &interface,
+                                       const std::string &member);
+
+  // Handles callback on DBus messages by DBus system.
+  static DBusHandlerResult DBusCallback(DBusConnection *dbus_conn,
+                                        DBusMessage *message,
+                                        void *instance);
+
+  // Handles callback on DBus messages to each DBusSigFilter instance.
+  DBusHandlerResult Callback(DBusMessage *message);
+
+  // From MessageHandler.
+  virtual void OnMessage(Message *message);
+
+  // Returns the DBus monitor filter string.
+  const std::string &filter() const { return filter_; }
+
+ private:
+  // On caller thread.
+  virtual void ProcessSignal(DBusMessage *message) = 0;
+
+  Thread *caller_thread_;
+  const std::string filter_;
+};
+
+// DBusMonitor is a class for DBus signal monitoring.
+//
+// The caller-thread calls AddFilter() first to add the signals that it wants to
+// monitor and then calls StartMonitoring() to start the monitoring.
+// This will create a worker-thread which listens on DBus connection and sends
+// DBus signals back through the callback.
+// The worker-thread will be running forever until either StopMonitoring() is
+// called from the caller-thread or the worker-thread hit some error.
+//
+// Programming model:
+//   1. Caller-thread: Creates an object of DBusMonitor.
+//   2. Caller-thread: Calls DBusMonitor::AddFilter() one or several times.
+//   3. Caller-thread: StartMonitoring().
+//      ...
+//   4. Worker-thread: DBus signal recieved. Post a message to caller-thread.
+//   5. Caller-thread: DBusFilterBase::ProcessSignal() is invoked.
+//      ...
+//   6. Caller-thread: StopMonitoring().
+//
+// Assumption:
+//   AddFilter(), StartMonitoring(), and StopMonitoring() methods are called by
+//   a single thread. Hence, there is no need to make them thread safe.
+class DBusMonitor {
+ public:
+  // Status of DBus monitoring.
+  enum DBusMonitorStatus {
+    DMS_NOT_INITIALIZED,  // Not initialized.
+    DMS_INITIALIZING,     // Initializing the monitoring thread.
+    DMS_RUNNING,          // Monitoring.
+    DMS_STOPPED,          // Not monitoring. Stopped normally.
+    DMS_FAILED,           // Not monitoring. Failed.
+  };
+
+  // Returns the DBus-Glib symbol table.
+  // We should only use this function to access DBus-Glib symbols.
+  static LibDBusGlibSymbolTable *GetDBusGlibSymbolTable();
+
+  // Creates an instance of DBusMonitor.
+  static DBusMonitor *Create(DBusBusType type);
+  ~DBusMonitor();
+
+  // Adds a filter to DBusMonitor.
+  bool AddFilter(DBusSigFilter *filter);
+
+  // Starts DBus message monitoring.
+  bool StartMonitoring();
+
+  // Stops DBus message monitoring.
+  bool StopMonitoring();
+
+  // Gets the status of DBus monitoring.
+  DBusMonitorStatus GetStatus();
+
+ private:
+  // Forward declaration. Defined in the .cc file.
+  class DBusMonitoringThread;
+
+  explicit DBusMonitor(DBusBusType type);
+
+  // Updates status_ when monitoring status has changed.
+  void OnMonitoringStatusChanged(DBusMonitorStatus status);
+
+  DBusBusType type_;
+  DBusMonitorStatus status_;
+  DBusMonitoringThread *monitoring_thread_;
+  std::vector<DBusSigFilter *> filter_list_;
+};
+
+}  // namespace rtc
+
+#endif  // HAVE_DBUS_GLIB
+
+#endif  // WEBRTC_BASE_DBUS_H_