Remove X11 and GTK dependencies from host_forwarder

base/message_loop/message_loop.h

 // 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.
 
 #ifndef BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_
 #define BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_
 
 #include <queue>
 #include <string>
 
@@ skipping 20 matching lines @@
 #elif defined(OS_IOS)
 #include "base/message_loop/message_pump_io_ios.h"
 #elif defined(OS_POSIX)
 #include "base/message_loop/message_pump_libevent.h"
 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
 
 #if defined(USE_AURA) && defined(USE_X11) && !defined(OS_NACL)
 #include "base/message_loop/message_pump_x11.h"
 #elif defined(USE_OZONE) && !defined(OS_NACL)
 #include "base/message_loop/message_pump_ozone.h"
-#else
+#elif !defined(OS_ANDROID_HOST)
 #define USE_GTK_MESSAGE_PUMP
 #include "base/message_loop/message_pump_gtk.h"
 #if defined(TOOLKIT_GTK)
 #include "base/message_loop/message_pump_x11.h"
 #endif
 #endif
 
 #endif
 #endif
 
 namespace base {
 
 class HistogramBase;
 class MessagePumpObserver;
 class RunLoop;
 class ThreadTaskRunnerHandle;
 #if defined(OS_ANDROID)
 class MessagePumpForUI;
+#elif defined(OS_ANDROID_HOST)
+typedef MessagePumpLibevent MessagePumpForUI;
 #endif
 class WaitableEvent;
 
 // A MessageLoop is used to process events for a particular thread.  There is
 // at most one MessageLoop instance per thread.
 //
 // Events include at a minimum Task instances submitted to PostTask and its
 // variants.  Depending on the type of message pump used by the MessageLoop
 // other events such as UI messages may be processed.  On Windows APC calls (as
 // time permits) and signals sent to a registered set of HANDLEs may also be
@@ skipping 640 matching lines @@
 
 // Do not add any member variables to MessageLoopForIO!  This is important b/c
 // MessageLoopForIO is often allocated via MessageLoop(TYPE_IO).  Any extra
 // data that you need should be stored on the MessageLoop's pump_ instance.
 COMPILE_ASSERT(sizeof(MessageLoop) == sizeof(MessageLoopForIO),
                MessageLoopForIO_should_not_have_extra_member_variables);
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_