Adding MOJO_HANDLE_SIGNAL_PEER_CLOSED to be notified when a peer is closed.

mojo/edk/system/local_message_pipe_endpoint.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/local_message_pipe_endpoint.h"
 
 #include <string.h>
 
 #include "base/logging.h"
 #include "mojo/edk/system/dispatcher.h"
@@ skipping 119 matching lines @@
 HandleSignalsState LocalMessagePipeEndpoint::GetHandleSignalsState() const {
   HandleSignalsState rv;
   if (!message_queue_.IsEmpty()) {
     rv.satisfied_signals |= MOJO_HANDLE_SIGNAL_READABLE;
     rv.satisfiable_signals |= MOJO_HANDLE_SIGNAL_READABLE;
   }
   if (is_peer_open_) {
     rv.satisfied_signals |= MOJO_HANDLE_SIGNAL_WRITABLE;
     rv.satisfiable_signals |=
         MOJO_HANDLE_SIGNAL_READABLE | MOJO_HANDLE_SIGNAL_WRITABLE;
+  } else {
+    rv.satisfied_signals |= MOJO_HANDLE_SIGNAL_PEER_CLOSED;
   }
+  rv.satisfiable_signals |= MOJO_HANDLE_SIGNAL_PEER_CLOSED;
   return rv;
 }
 
 MojoResult LocalMessagePipeEndpoint::AddWaiter(
     Waiter* waiter,
     MojoHandleSignals signals,
     uint32_t context,
     HandleSignalsState* signals_state) {
   DCHECK(is_open_);
 
@@ skipping 16 matching lines @@
 void LocalMessagePipeEndpoint::RemoveWaiter(Waiter* waiter,
                                             HandleSignalsState* signals_state) {
   DCHECK(is_open_);
   waiter_list_.RemoveWaiter(waiter);
   if (signals_state)
     *signals_state = GetHandleSignalsState();
 }
 
 }  // namespace system
 }  // namespace mojo