Mojo: add support for disallowing sync calls for a process.

mojo/public/c/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/c/system/thunks.h"
 
 #include <assert.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 264 matching lines @@
                                                    num_bytes, flags);
 }
 
 MojoResult MojoNotifyBadMessage(MojoMessageHandle message,
                                 const char* error,
                                 size_t error_num_bytes) {
   assert(g_thunks.NotifyBadMessage);
   return g_thunks.NotifyBadMessage(message, error, error_num_bytes);
 }
 
+MojoResult MojoGetProperty(MojoPropertyType type, void* value) {
+  assert(g_thunks.GetProperty);
+  return g_thunks.GetProperty(type, value);
+}
+
 }  // extern "C"
 
 size_t MojoEmbedderSetSystemThunks(const MojoSystemThunks* system_thunks) {
   if (system_thunks->size >= sizeof(g_thunks))
     g_thunks = *system_thunks;
   return sizeof(g_thunks);
 }