Make it possible to remove an Awakable with a specific "context" from a Dispatcher.

mojo/edk/system/message_pipe.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/message_pipe.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/logging.h"
@@ skipping 197 matching lines @@
                                  Awakable* awakable,
                                  HandleSignalsState* signals_state) {
   DCHECK(port == 0 || port == 1);
 
   MutexLocker locker(&mutex_);
   DCHECK(endpoints_[port]);
 
   endpoints_[port]->RemoveAwakable(awakable, signals_state);
 }
 
+void MessagePipe::RemoveAwakableWithContext(unsigned port,
+                                            Awakable* awakable,
+                                            uint64_t context,
+                                            HandleSignalsState* signals_state) {
+  DCHECK(port == 0 || port == 1);
+
+  MutexLocker locker(&mutex_);
+  DCHECK(endpoints_[port]);
+
+  endpoints_[port]->RemoveAwakableWithContext(awakable, context, signals_state);
+}
+
 void MessagePipe::StartSerialize(unsigned /*port*/,
                                  Channel* channel,
                                  size_t* max_size,
                                  size_t* max_platform_handles) {
   *max_size = channel->GetSerializedEndpointSize();
   *max_platform_handles = 0;
 }
 
 bool MessagePipe::EndSerialize(
     unsigned port,
@@ skipping 143 matching lines @@
       LOG(WARNING) << "Enqueueing null dispatcher";
       handles->push_back(Handle());
     }
   }
   message->SetHandles(std::move(handles));
   return MOJO_RESULT_OK;
 }
 
 }  // namespace system
 }  // namespace mojo