Add a mechanism to extend a libevent based message pump.

message_loop/message_loop.cc

 // 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.
 
 #include "base/message_loop/message_loop.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 690 matching lines @@
     MessagePumpLibevent::Watcher *delegate) {
   return static_cast<MessagePumpLibevent*>(pump_.get())->WatchFileDescriptor(
       fd,
       persistent,
       mode,
       controller,
       delegate);
 }
 #endif
 
+#if defined(USE_X11)
+void MessageLoopForUI::SetEventSource(
+    MessagePumpLibevent::EventSource* event_source) {
+  static_cast<MessagePumpLibevent*>(pump_.get())->SetEventSource(event_source);
+}
+
+void MessageLoopForUI::ClearEventSource() {
+  static_cast<MessagePumpLibevent*>(pump_.get())->ClearEventSource();
+}
+#endif
+
 #endif  // !defined(OS_NACL)
 
 //------------------------------------------------------------------------------
 // MessageLoopForIO
 
 #if !defined(OS_NACL_SFI)
 void MessageLoopForIO::AddIOObserver(
     MessageLoopForIO::IOObserver* io_observer) {
   ToPumpIO(pump_.get())->AddIOObserver(io_observer);
 }
@@ skipping 26 matching lines @@
       persistent,
       mode,
       controller,
       delegate);
 }
 #endif
 
 #endif  // !defined(OS_NACL_SFI)
 
 }  // namespace base