[mojo] Implement pipe fusion API

mojo/public/platform/native/system_thunks.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 "mojo/public/platform/native/system_thunks.h"
 
 #include <assert.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 182 matching lines @@
                      uintptr_t context) {
   assert(g_thunks.Watch);
   return g_thunks.Watch(handle, signals, callback, context);
 }
 
 MojoResult MojoCancelWatch(MojoHandle handle, uintptr_t context) {
   assert(g_thunks.CancelWatch);
   return g_thunks.CancelWatch(handle, context);
 }
 
+MojoResult MojoFuseMessagePipes(MojoHandle handle0, MojoHandle handle1) {
+  assert(g_thunks.FuseMessagePipes);
+  return g_thunks.FuseMessagePipes(handle0, handle1);
+}
+
 extern "C" THUNK_EXPORT size_t MojoSetSystemThunks(
     const MojoSystemThunks* system_thunks) {
   if (system_thunks->size >= sizeof(g_thunks))
     g_thunks = *system_thunks;
   return sizeof(g_thunks);
 }
 
 }  // extern "C"