Add Dispatcher methods for wait sets.

mojo/edk/system/entrypoint_class.h

 // Copyright 2016 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 MOJO_EDK_SYSTEM_ENTRYPOINT_CLASS_H_
 #define MOJO_EDK_SYSTEM_ENTRYPOINT_CLASS_H_
 
 namespace mojo {
 namespace system {
 
@@ skipping 18 matching lines @@
   DATA_PIPE_PRODUCER,
 
   // |Dispatcher::SetDataPipeConsumerOptions()|,
   // |Dispatcher::GetDataPipeConsumerOptions()|, |Dispatcher::ReadData()|,
   // |Dispatcher::BeginReadData()|, |Dispatcher::EndReadData()|:
   DATA_PIPE_CONSUMER,
 
   // |Dispatcher::DuplicateBufferHandle()|,
   // |Dispatcher::GetBufferInformation()|, |Dispatcher::MapBuffer()|:
   BUFFER,
+
+  // |Dispatcher::WaitSetAdd()|, |Dispatcher::WaitSetRemove()|,
+  // |Dispatcher::WaitSetWait()|:
+  WAIT_SET,
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_ENTRYPOINT_CLASS_H_