Add sender verification of D-Bus signals.

dbus/bus.h

 // Copyright (c) 2012 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 DBUS_BUS_H_
 #define DBUS_BUS_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 423 matching lines @@
   virtual void AssertOnOriginThread();
 
   // Check whether the current thread is on the D-Bus thread. If not,
   // DCHECK will fail. If the D-Bus thread is not supplied, it calls
   // AssertOnOriginThread().
   virtual void AssertOnDBusThread();
 
   // Returns true if the bus is connected to D-Bus.
   bool is_connected() { return connection_ != NULL; }
 
+  // Processes the all incoming data to the connection, if any.
+  //
+  // BLOCKING CALL.
+  void ProcessAllIncomingDataIfAny();
+
  protected:
   // This is protected, so we can define sub classes.
   virtual ~Bus();
 
  private:
   friend class base::RefCountedThreadSafe<Bus>;
 
   // Helper function used for UnregisterExportedObject().
   void UnregisterExportedObjectInternal(
       scoped_refptr<dbus::ExportedObject> exported_object);
 
   // Helper function used for ShutdownOnDBusThreadAndBlock().
   void ShutdownOnDBusThreadAndBlockInternal();
 
   // Helper function used for RequestOwnership().
   void RequestOwnershipInternal(const std::string& service_name,
                                 OnOwnershipCallback on_ownership_callback);
 
   // Called when the ownership request is completed.
   void OnOwnership(OnOwnershipCallback on_ownership_callback,
                    const std::string& service_name,
                    bool success);
 
-  // Processes the all incoming data to the connection, if any.
-  //
-  // BLOCKING CALL.
-  void ProcessAllIncomingDataIfAny();
-
   // Called when a watch object is added. Used to start monitoring the
   // file descriptor used for D-Bus communication.
   dbus_bool_t OnAddWatch(DBusWatch* raw_watch);
 
   // Called when a watch object is removed.
   void OnRemoveWatch(DBusWatch* raw_watch);
 
   // Called when the "enabled" status of |raw_watch| is toggled.
   void OnToggleWatch(DBusWatch* raw_watch);
 
@@ skipping 64 matching lines @@
   int num_pending_timeouts_;
 
   std::string address_;
 
   DISALLOW_COPY_AND_ASSIGN(Bus);
 };
 
 }  // namespace dbus
 
 #endif  // DBUS_BUS_H_