Add sender verification of D-Bus signals.

dbus/bus.h

Index: dbus/bus.h
diff --git a/dbus/bus.h b/dbus/bus.h
index 6f31b37ab76331ecc744c54d89518702aacddde5..ddcafa286900f16e778e5324df3dc1129c91c64c 100644
--- a/dbus/bus.h
+++ b/dbus/bus.h
@@ -441,6 +441,11 @@ class Bus : public base::RefCountedThreadSafe<Bus> {
   // 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();
@@ -464,11 +469,6 @@ class Bus : public base::RefCountedThreadSafe<Bus> {
                    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);