[mojo-edk] Add MojoWatch and MojoCancelWatch APIs

mojo/edk/system/dispatcher.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/edk/system/dispatcher.h"
 
 #include "base/logging.h"
 #include "mojo/edk/system/configuration.h"
 #include "mojo/edk/system/data_pipe_consumer_dispatcher.h"
 #include "mojo/edk/system/data_pipe_producer_dispatcher.h"
 #include "mojo/edk/system/message_pipe_dispatcher.h"
 #include "mojo/edk/system/platform_handle_dispatcher.h"
 #include "mojo/edk/system/shared_buffer_dispatcher.h"
 
 namespace mojo {
 namespace edk {
 
 Dispatcher::DispatcherInTransit::DispatcherInTransit() {}
 
 Dispatcher::DispatcherInTransit::DispatcherInTransit(
     const DispatcherInTransit& other) = default;
 
 Dispatcher::DispatcherInTransit::~DispatcherInTransit() {}
 
+MojoResult Dispatcher::Watch(MojoHandleSignals signals,
+                             const Watcher::WatchCallback& callback,
+                             uintptr_t context) {
+  return MOJO_RESULT_INVALID_ARGUMENT;
+}
+
+MojoResult Dispatcher::CancelWatch(uintptr_t context) {
+  return MOJO_RESULT_INVALID_ARGUMENT;
+}
+
 MojoResult Dispatcher::WriteMessage(const void* bytes,
                                     uint32_t num_bytes,
                                     const DispatcherInTransit* dispatchers,
                                     uint32_t num_dispatchers,
                                     MojoWriteMessageFlags flags) {
   return MOJO_RESULT_INVALID_ARGUMENT;
 }
 
 MojoResult Dispatcher::ReadMessage(void* bytes,
                                    uint32_t* num_bytes,
@@ skipping 140 matching lines @@
       return nullptr;
   }
 }
 
 Dispatcher::Dispatcher() {}
 
 Dispatcher::~Dispatcher() {}
 
 }  // namespace edk
 }  // namespace mojo