Adds MessageLoopUIApplication for use on iOS.

base/message_loop.cc

 // 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.
 
 #include "base/message_loop.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 702 matching lines @@
 }
 #endif  // defined(OS_WIN)
 
 #if defined(OS_ANDROID)
 void MessageLoopForUI::Start() {
   // No Histogram support for UI message loop as it is managed by Java side
   static_cast<base::MessagePumpForUI*>(pump_.get())->Start(this);
 }
 #endif
 
+#if defined(OS_IOS)
+void MessageLoopForUI::Attach() {
+  static_cast<base::MessagePumpUIApplication*>(pump_.get())->Attach(this);
+}
+#endif
+
 #if !defined(OS_MACOSX) && !defined(OS_NACL) && !defined(OS_ANDROID)
 void MessageLoopForUI::AddObserver(Observer* observer) {
   pump_ui()->AddObserver(observer);
 }
 
 void MessageLoopForUI::RemoveObserver(Observer* observer) {
   pump_ui()->RemoveObserver(observer);
 }
 
 #endif  //  !defined(OS_MACOSX) && !defined(OS_NACL) && !defined(OS_ANDROID)
@@ skipping 20 matching lines @@
                                            Watcher *delegate) {
   return pump_libevent()->WatchFileDescriptor(
       fd,
       persistent,
       static_cast<base::MessagePumpLibevent::Mode>(mode),
       controller,
       delegate);
 }
 
 #endif